Why is it so bad to make an apology post for your actions?
It's not against the rules, but it never looks great.
If you're making an apology topic then you probably want forgiveness for your past behaviour. Now being sorry is fine, and wanting to be forgiven is good, but it's not enough to just ask for it. The only way I can truly trust that you're not going to repeat your actions, is for you to stop doing those actions for a long time.
If you make a public apology before you've stopped acting out, then you're asking for forgiveness before you've proven to everyone that you can stop.
The other side of that is that if you stop acting out, to the point that people no longer bring up your past actions, or hate you for it, then you've already been forgiven and don't need to make a topic apologising.
And then in caxto's case, he's been gone for almost 2 years. Not many people remember him, or the trouble he may have caused.
Him making a public apology is just thrusting his long-forgotten actions back into the public eye.
It's good that it still weighs on him, and he is apologetic for how he used to behave, but no apology was necessary.
He could have just jumped back into the forums without issue. So long as he continued to not cause trouble his past would likely never come up.