There is evil in this world ...because evil exists.  It exists largely because we allow it to exist.  And we allow it to exist because it is part of each and every one of us.  But it doesn't have to be the part within us that emerges as the victor.  There is also good ...and it is a part of each and every one of us.  We are all born with goodness, but from that moment on, we can also be taught not to be good.  It becomes really problematic when our idea of good consists of increasing tolerance for that which is not good.  We should all practice tolerance, but not to the extent of blind permissiveness of anything we deem as a freedom or right.