Every evil has a reason, but all evil has no excuse. I can't be obliged to be evil just because evil comes from above; I can't be worthy to be evil just because everyone else is so evil: I can't even have the right to be evil to others just because someone is evil to me. 
every specific evil must be condemned. If respect for life must be in the single digits, so must the condemnation of sin.
During the Cultural Revolution, Huang Xiaomeng, a university student, criticized their university professors, beating one of them and maiming them. At that time, the whole of China was crazy, he was just wrapped into this crazy, and he was too young at the time...