perspective from people who bullies others

This could part be an answer to my Q2.

 People pick on someone for many reasons. The most reasons why they might do it are that he or she looks weak in fight, and that the way he or she behaves is strange and different from theirs. It seems that if you look small and are likely to have less power than someone, he wants to show that he's stronger than you, and shows it by action. You feel uncomfortable and actually hurt in the body. But he says that he does it not for harassment, but for his mere curiosity and he doesn't feel sorry at all.
 Another reason for bullying is that people pick on someone to remove their stress. As the days go on, they feel tired and fed up of everything, so they do it to relieve their mind like fighting video games. They think of you as an enemy so they kick and punch you in the mind and trunk.

Well, I THINK that people are only justifying the bullying by saying they have exact reasons to do it.
They don't stand in your place and consider your feeling, I GUESS.