do you think Itachi's plotwist (him being a good guy) resulted in many characters getting ruined/hate ? ( Sasuke/ Hiruzen/ Tobirama/ the dead Uchiha clan..)
Personally, I don't think Itachi was a good guy for what he did, I mean, do you really think Itachi commiting ethnic genocide ordered by the village that oppressed them, because of a coup that was plotted because of the discrimination and xenophobia the Uchiha clan suffered for decades, was him being a good guy?
Well, doesn't look like a good guy to me, but then I'd be writing another essay, and I think you meant the way some people view him, so I'll go to the point.
Tobirama and Hiruzen, both were still dictators on the facist regime of Konoha, with or without the massacre. That's no news, I mean, plenty of hate is deserved.
They were already "ruined" and received a lot of hate, before the plot twist was even known. So the result was still the same with or without it, I think the only change is that the hate got even worse – but it was always there.
Maybe this is unnecessary, but I'll start with Hiruzen and a few examples:
Hiruzen was hated from the beginning. We knew he was "neglecting" Naruto and letting him get ostracized for something he didn't even chose to, suffering his whole childhood alone, and being shunned. He failed Naruto:
Hiruzen talks and talks about that he wants to protect the village and that they're their family (during Konoha Crush, though he treated that family like tools as he spoke, so not much to expect) but he couldn't even protect a kid, couldn't even give him a caretaker, someone to look for him, support him, raise him right, he wasn't even that person. He claims to care greatly for Minato, but he didn't even look after his son properly. He didn't even accomplish Naruto parents's wishes.
Gosh, Naruto lacked so much attention that he tried to gain it by committing mischief and his whole objective of being Hokage is needing acknowledgment, validation, respect. He didn't had the proper guidance. He had a house, so? That doesn't even make up for what he really needed. He stopped committing mischief after Iruka recognized him!
Keeping a secret that Naruto was a sacrifice for the village and was the Kyuubi from Naruto and those children, did more harm than good to Naruto. Hiruzen saw the consequences right in front of him and decided to let Naruto be treated that awful way. Also, people often say that Naruto "respected" Hiruzen despite him being neglected by him, but he solely respected Hiruzen sacrifice for the village, nothing more, nothing less. His sacrifice shouldn't even be glorified, Hiruzen should've killed Orochimaru when he had the chance, and during Hiruzen's death, Sunagakure and Otogakure had already attacked Konoha, causing massive losses and destroying it.
Hiruzen wasn't even that relevant in Naruto's life, not once he thinks about him when he talks about the people who helped him through his loneliness. (The one he mostly thinks about first is Iruka)
+ He also failed Sasuke, but then I'd be involving the massacre.
Second example: Orochimaru.l + Hiruzen said Orochimaru concealed malice and ambition, but he trained him to be a very powerful and capable shinobi, pretending not to notice Orochimaru's malice. And also Hiruzen sent him to war: and Orochimaru had to witness Nawaki and Dan death, he had to see the horrors of war, and that war also led him to want to learn every technique in the world, which culminanted on his experiments and who he ended up becoming and what he ended up doing + his parents death also affected him deeply, etc. (I'm not defending Orochimaru actions, I think he didn't deserve redemption at all, I'm just talking about of Hiruzen failing as a teacher and Hokage)
Orochimaru was kidnapping, torturing, murdering and experimenting with innocent people and Hiruzen HAD to kill him because Orochimaru said he wasn't going to stop until he found out the secrets of immortality and mastered all the jutsus he could, I didn't include the panel of this, but he said:
I want to obtain all the techniques and gain a true understanding of everything in this world. The first one to mix blue and yellow called the new color "green". I want to do something similar to that. If blue is the chakra, then yellow is the seal, and green is the technique... Just as there is no end to the variety of colors, there are so many thousands… tens of thousands of techniques in the world as well. But in order to obtain every possible technique and truth, it would require an eternity. Only one who understands everything after spending such time on this can be fittingly called the Ultimate Being.
Hiruzen could've avoided many deaths, many conflicts, many experiments, many kidnappings, many things. But no, he couldn't bring himself to kill Orochimaru and allowed him to escape. (Orochimaru was literally KILLING and TORTURING and EXPERIMENTING with innocent people, so the justification of that Orochimaru was his student so he couldn't kill him is just so horrendous and repulsive, like, look at Hashirama, he had to take Madara's life, his best friend, for the village + even Jiraiya was determinated and willing to kill Tsunade if she healed Orochimaru because then, Konoha would be in great danger)
Third example: The Hyuga clan.
Hiruzen clearly knew that the Hyuga clan dysfunction, that they endorsed slavery, the seal, the main house and branch house not being equals, the oppression. He let it continue.
He claims that he wants to protect the village and the people on it, but he failed again to protect the cadet branch who lived to serve the main branch and were below them, oppressed, being treated unfairly, being sealed and only being able to be free of the seal by dying. He could've changed the way it worked, but he decided not to. ALSO, HE LET NEJI AND HINATA FIGHT AND HE THOUGHT IT WAS ENTERTAINING. He knew Neji was from the cadet branch, and Hinata was from the main branch, but no.
The hypocrisy of this man is incredible.
I can give more examples, but I'll end it here with Hiruzen.
Well, now, Tobirama, the one that created Edo Tensei:
He's not too far from Orochimaru, you know, using people as sacrifices to experiment and make those deceased people killing machines for his own benefit. Such repulsive jutsu.
Tobirama also oppressed the Uchiha clan, democracy became nonexistent in Konoha after he succeeded and created the ninja institution for the kids – the chunin exams; training children become tools to kill and sacrifice for the village. 12, more or less, year old children killing each other to be promoted on their military status..well. Need to elaborate?
And yeah, the Uchiha clan gets hate because of that one plot twist – hate that is undeserved. But that hate is from people who refuse to acknowledge what the clan went through, Sasuke's trauma, how a coup works, etc, either that, or are actually Itachi apologists.