I'm pretty sure that Harry does not support Trump. He may have posed memes of him like the other 90% of the Internet, however this in no way means he supports Trump or his actions. Maybe I'm wrong though, and if so, please send me a screenshot where he genuinely says that he support him.
Yes, JJ has done all of those things you've listed. However, since then he has owned up to his mistakes and tried fixing them. He's tried his best to delete his old videos showing where he used to do his "rape face" which shows that he's learnt from his actions. That shows me that he can still improve himself and learn from his mistakes.
What happened at Upload this weekend was disgusting, and I am in no way trying to defend JJ for what he's said. Although, I do think that eventually he will learn from his actions like has done in his past. Hopefully that will be sooner rather than later.
You're right, Harry does do a lot of stuff that JJ also used to do in his past. That doesn't mean though that Harry can't learn from his mistakes either. Harry is roughly the same age as JJ was when he was saying some nasty things, so I believe that eventually Harry will too learn from his actions.
I didn't know that you had thanked the people that corrected you because I have no reason to look at your blog. If you did however, then good on you.