EQUAL OPPORTUNITIES

when i first heard this it sat with me, it's a great film, very shakespearian in it's tragedy and yet indicated at the end how even those who had crossed the divide could make a sacrifice and redeem themselves. it's a film of twists and turns and apart from batmans stupid voice almost perfect. this line did stay with me, as it was a great meditation on the nature of evil and if you want to be scientific, psychopathology.
one could say this occurs over a certain powerful trauma, event or some sort of defective program, one could say it's all chemistry in which case alcohol won't do you any favours, neither will recreational drugs assist adjust the balance, although shamanic medicines and lsd may help. the pathology of the psychopath is demonic, science will never cure them. it has to be a battle of the very soul of the individual for no one wants to be a psychopath, only some one who is totally lost to their humanity can act in this way. often these types are masters of deception, they have built elaborate masks and webs around themselves and many people fall into their deceit, manipulation and subterfuge is their arena, and they can be very convincing. 
however the controlling persona underneath the multitude of masks will have 'evil' intent, it will distort it's own perception to shape it's own investment in itself. we all do this to a certain extent but the psychopathic individual does this by calculation. 
the controlling force that directs them is not entirely human.