There is no good or evil. Now, that doesn't give sociopaths and in-general shitheads the world over an out. They're still destructive individuals that society could happily go without...but they do serve a purpose. These radical individuals show us the condition of our society. They, in a sense, are our "canary in the coal mine". Since these individuals are destructive by nature, they typically latch on to destructive ideas, philosophies, etc. Thanks to these destructive individuals, the rest of us know what to avoid in our species in order to thrive and progress.

I have come to some of the same conclusions about good+evil, that is: the lack of these except as concepts created by us to serve a very useful purpose, to designate destructive behaviour as a thing, something we can name, recognise, rally against. I like the canary analogy.