It is hard to do the right thing when the right and wrong are both defined relatively – primarily the reason why the world is sick.
Doing the right thing specially becomes difficult when how you really feel clashes with it. It is like thinking about it and finding it good in your head only to realize that your chest is revolting. Besides, there is nothing more satisfying than revenge, or redemption, or basically just doing anything you desire.
But to give justice to being human, just because we can do it does not really mean we should.