there are always plenty of bad people and it's difficult for them to understand why one wants to be good. Good people get hurted by bad ones. Then the question is should the hurted learn how to deal with bad ones or make the bad understand why one wants to be good. The first option inevitably converts some good people to bad ones, but is the second option realistic? From the histroy, the answer is no. But who knows. we don't know where are heading for. We've been seeing so much that has never been seen before. 

maybe the art is to stay in the middle of good and bad and enjoy the benefits of both. Anyway, there are many very good reasons for the exitence of both good and bad ones.