Actions tend to be motivated by interests, and so no matter how horrible an act is it is almost always feeding someone. If someone is murdering on our behalf, should we not oppose those murders? If we are murdering on our own behalf, should we not struggle with ourselves? The answers to these questions are obvious, as is the shallowness and putridness of "don't bite the hand that feeds you."
Bite the hand that does evil if it comes within bite's reach. Bite it when it comes into reach or a minimum your actions will endorse the evil it carries out. You aren't an idiot for going against your own individual interests because morality is about more your individual self interest.