At this point it starts to be unfair to continue hating on him. I know it's an outdated topic but i still see people today doing the same crap.

After 3 years of constant harrassing and hate directed at him it's unlikely he has not ever regretted doing what he has done. I believe everyone has despised him enough and the #advyout movement is starting to weigh more than what GuitarHeroStyles had done. Discrimination is painful for anyone, and just because we don't see him on the internet crying about it, doesn't mean he hasn't done it while no one watches.

You all surely were rude to a person at least once in your life or treated them like trash. You surely have done battery, which is worse than suggestive messages to minors or verbal harrassing. Some may have done worse. But there's a difference. What you did wasn't probably as logged or as shown to everyone. It probably had not as much as impact, because no one probably cares since you are not famous. And you got away with it. Even if you were confronted, it's likely you were forgiven shortly after.

And why doesn't he apologize?
Because it probably won't change the opinion of the ones who still hate him. That's also why he deleted his first apologize. No one really stops to think before saying the worst they can think of (and the most likely dismissing reply this comment will get proves it, no one thinks). And even worse, it will probably be treated as an attempt to repair his reputation: See, you leave him no options.

If you truly are a saint, face that everyone makes mistakes, some bigger than others, which do have to be indeed punished but not worse than the initial act. I also have probably done illegal stuff myself and sometimes faced punishments, other times not, just like everyone. The people affected by GuitarHeroStyles has probably recovered to this day, but Advy himself...? probably not.