The Jedi did not teach Anakin to ignore and suppress his emotions. The Jedi have never, at any point, said that anger was a bad thing, but they were right about the fact that anger can lead to the dark side. This isn't because feeling anger makes you bad. How you choose to process that anger is what matters. Becoming angry and slaughtering innocent people is not, in fact, the way you're supposed to handle your feelings.
The Jedi never once invalidated Anakin's pain, but taking out your pain on others is not okay. Anakin is so strong with the Force that he was able to bring two gods to their knees. No one else has that kind of power. It's the kind of power that the Jedi were trying to teach Anakin to use responsibly. It's the kind of power that the Sith preyed upon and craved because they wanted to use those powers to oppress and dominate others by any means necessary.
It takes a lot of strength to resist the dark side. A lot more strength to restrain yourself when you know the kind of damage that you're capable of doing if you decide to take your anger out on everyone else.
The Jedi were not using Anakin for his powers. Darth Sidious was using Anakin for his powers and accusing the Jedi of doing the things that Darth Sidious himself was guilty of doing. He was the one who had been hiding things from Anakin. It took Anakin 13 years to learn that Palpatine, a man he looked up to, was secretly a Sith Lord. Palpatine did not give one single shit about Anakin. He only cared about using Anakin's power to oppress people instead of helping them, and he manipulated the shit out of Anakin in the process.
Everyone in the Jedi Order knew who Anakin Skywalker was. The Jedi trusted him. Many of them died having absolutely zero idea that Anakin Skywalker betrayed them. Many died by Anakin's hand. Many of them were defenseless children who were not even old enough to wield their own lightsabers yet. Many of those children ran to Anakin during Order 66 because they believed he was there to help them.
Anakin's future had always been clouded and the Jedi were fully aware of just how strong he was. It's why they were so hesitant to train him initially, but they also understood it was why they needed to train him.
The Jedi Council had started to become distrustful of Anakin the more that Palpatine tried to force his way into their innermost circle through his connection to Anakin. The Jedi Council was absolutely right to be alarmed by Anakin's reaction to being denied the rank of master. The Jedi don't hand out participation trophies. Palpatine was appointing a Jedi Knight to a position on the Jedi Council that Anakin did not earn and did not deserve. In order to be on the council, you have to be a Jedi master. Anakin doesn't get to fast track his way to Jedi master by virtue of being appointed to the council by someone who wasn't even a Jedi. Palpatine appointed Anakin to the council for obvious nefarious purposes.
If Anakin had chosen to listen to Yoda's advice ("train yourself to let go of everything you fear to lose") rather than buying into Palpatine's lies about being able to prevent people he loved from dying, Padme might not have even died. It wasn't wrong for Anakin to love Padme (it wasn't love that drove his actions but rather possessiveness), but he sacrificed thousands of lives just to save hers, and she still ended up dying anyway. The Jedi were executed for crimes they did not commit because Anakin allowed his fears to guide his choices, knowing the devastation he was about to cause.
The patience of the Sith is what paid off in the end. Palpatine spent 13 years grooming Anakin for this very moment. Anakin made the choice to sacrifice the Jedi, knowing what the right choice would have been, but his refusal to let go of Padme caused him to make the most selfish choice possible and the entire Jedi Order paid the price.
He chose to follow Palpatine's teachings and immediately chose to obey Palpatine's orders to kill all the Jedi at the Jedi temple. He proved he was willing to sacrifice countless lives to save one. In his mind it was completely rational to want the power to prevent others from dying while also actively taking the lives of innocents in order to learn how to achieve that power. He let his anger control his actions so much that he Force choked the woman he sacrificed the Jedi Order for because she rejected his power (which he tells her he did all for her) and told him she could no longer be with him. He accused her of betraying him even though she was trying to save him from the path he was headed down.
It's never too late to do the right thing as long as you are still alive to do the right thing. Redemption starts with a choice and has nothing to do with whether or not someone deserves it. Anakin accepting all sides of himself is what set him free. He was in a prison of his own making, tried to separate Darth Vader from Anakin Skywalker by claiming he killed Anakin. Viewed Anakin's compassion as a weakness to be ashamed of rather than a strength to be proud of.
The Jedi were not saints. There were regular people with extraordinary abilities making the choice to be the best version of themselves that they could. They learned how to achieve emotional balance, which is what made them good peacekeepers. They combat aggression through diplomacy, and the only reason diplomacy didn't work during the Clone Wars was because the Sith (Palpatine and Dooku) were never going to negotiate. They wanted to spread chaos and fear, to make people lose hope, to make people too scared to fight back, and it worked. They wanted to consolidate power. The Jedi had been turned into scapegoats, eventually labeled as terrorists, and found their very existences criminalized after the vast majority of them were massacred. Compassion became a crime while blind obedience and conformity became the law.
Anakin ultimately chose to become an instrument of the Sith. He made the choice to take out his pain on the rest of the galaxy and use his powers to strike fear into the hearts of nearly everyone he encountered. This is what happened because Anakin chose a destructive way to cope with his pain. No one else was making that choice for him. Yes, he was suffering, and there's no denying that, but it doesn't excuse the torture and death he inflicted upon his many, many victims.
