You misunderstand. While Holtz is responsible for doing the greatest damage to Connor's psyche, that doesn't alleviate Angel's responsibility, as a parent, to help Connor get deal with it and try to get better.

And let's face it, Angel did a fair share of his own damage by making some bad choices, once Connor showed back up in LA.

But the responsibility Angel shirked was getting Connor help, and as it showed in the comics, a do-over ended up not being the best choice when it came to getting Connor help.