Sorry is never a Sign of weakness.
Being SORRY or saying SORRY doesn't mean you are weak, it just meant that you are matured enough to let go conflicts and violence. Sorry is that simple word that has caused a lifetime destruction in peoples life, In schools, At work, In marriage and so many aspect of life.
This same SORRY is that word that has settled more than millions of upcoming violence, that has built so many marriage and safe the kids the experience of broken family.
Learning to say SORRY is very good but not only when you are at fault. And we shouldn't just say sorry, we should show it in our action that we are actually SORRY.