"Guilt is a strong emotion, to those that feel it. It's a potent learning experience and helps you stop repeating otherwise damaging overt anti-social behaviour if continued would definitely lead to ostracism, or worse.You know, you ought to remember your own words and live by them. perhaps then and only then will you stop hurting others with your "unthinking" actions.
I suppose when you are younger and don't have as deep an understanding of that there are repercussions to your actions that will affect others or yourself, if not now that most definitely later. Guilt is the realisation that such repercussions could have been avoided only if you hadn't screwed about half as much.
Realisation is such a strong word, which I believe many do not exhibit or experience enough in this world. People have a tendency to act and not care, not realise that they could have hurt someone or in fact just did.
This realisation, if taken positively, builds the foundation of supporting experiences necessary to live a happier life removed from avoidable bad experiences, because, well, you learned to avoid them by not doing them in the first place."
Because you know, a heart that has been shattered time and time again, might be left with little strength to ever heal completely...