[perl4ever]

Evil always pays more, because people want to be good; it's supply and demand. Doing evil stuff starts with telling yourself the lie that you can be good without sacrificing anything. And then when you get in the habit of doing stuff, it's extremely hard to react to changing events. I remember a scientist who worked on the atomic bomb project who wrote something to the effect of how everybody was really dedicated to beating the Nazis to the bomb and then all of a sudden it was like "welp, the Nazis are defeated, but might as well nuke somebody". People didn't question it like they could've because of the mental inertia. It's almost impossible to reevaluate what you're doing without being forced once you have invested a large amount into it over years.

You say somebody morally worse could take the job, but then again, that person might be less competent causing less damage to be done.

(I am not especially certain that Facebook is a supremely evil institution, just saying in general)