Have u seen the movie America beauty?, i think this movie has a answer for ur question.The hero (kevin spacey), at a point of his life, attains somewhat a advanced level of maturity, a high level of composure in himself. Although he is subjected to all kinds of misbehaviour in his surroudings, like his wife havig an affair, his daughter's friend wants to seduce him, his daily montonous job etc, he accepts them all as a part of life. But, he never lets himself affected by those bad influences. He is always the same loving father. If someone is doing something bad to you, if u react by doing the same bad think to them, then it proves that you are no better than that person. Well, infact it proves nothing!!!
"why should we become weak if all the people around us are weak."