True. But good people can do bad things and bad people do good things.I don't really believe in Good and Evil in the Biblical sense. But I do believe in love and hate and everything in between. That line does nothing but dilute truth. There is a big difference between...say...making a decision to bomb a town where terrorists are planning an attack, knowing a couple of civilians could get killed to spare thousands more...and building a compound such as Auschwitz to murder thousands of innocent people. That line has no relevance whatsoever in making such a distinction.
There are serial killers who love their mamas and sisters or daughters.