Null was legitimately trying to help Chris
Well, firstly, it's already stupid. He followed Chris for years and by that point he should've known better than trying to "help" Chris. Why in the hell he thought that he could do that at all? He is not his family, he is not a psychiatrist, he is a not even a tard wrangler, in the end he thought that he knows better than everyone else while he obviously didn't.
Secondly, you can help someone like Chris only by having some degree of control over him. I think, it's obvious that Null had barely any grip on Chris and in the end he just watched that no Idea Guys would take hold of him, which again, he failed, but funnily enough they failed too, because Chris did out of his own volition something so heinous, that they could never dream of.
Thirdly, Null actively disregarded anything bad that people brought up about Chris and don't you fucking dare to tell otherwise. I was here year ago, I remember how he begrudgingly put the recording on the main page and called it "some shit from Discord trannies". How he claimed "oh, Chris made this shit up to cover for something else", even though I can't recall him do that, beyond saying "I am at the mall" while being banned from there to trick trolls..I still can't believe that he was ready to give GoFundMe money to Chris after the news about what he did had brought up, but after Chris lied to him. Damn, his reasoning was "well, he earned those money", ok, and after he lied to him he suddenly didn't? That's fucked up, he should've asked Chris if he did it or not and then asked for a refund, no one would've blamed him.
TL;DR Yes, Null tried to help Chris, but did it with entirely wrong assumptions and actions for someone, who was following the tard for years, so in end he just let him do whatever he wanted, while protecting him from the more malicious of trolls, thus basically enabling him. Just like his parents, who didn't want him to be treated as a tard, but in the end enabled him into becoming one.