It is not true that good can only follow from good and evil only from evil, but that often the opposite is true.
There is no possible source of evil except good.
Bad people doing bad things is not interesting. What I find interesting is good people doing bad things.
I purposefully try to make films in that grey area, where things are morally ambiguous. It's like life: good people do horrible things, and bad people do good things, and there's beauty in horror and horror in beauty.
Truth and untruth often co-exist; good and evil often are found together
There are some faults so nearly allied to excellence that we can scarce weed out the vice without eradicating the virtue.
In years to come, he would be a giver of bread, not a stealer - proof again of the contradictory human being. So much good, so much evil. Just add water.
I'm not sure why I'm so drawn to heroes who do bad things and to villains who think they're the good guys, but I do find that moral ambiguity and conflict makes for great characters.