Generally speaking, ethics tend to refer to a societies system of belief, whereas morals refer to ones personal beliefs about right & wrong. Society tells us that stealing is wrong, regardless of our personal opinions about the victim (otherwise politicians in general would be robbed on a daily basis). Dragyn’s personal morals, on the other hand, say that in particular cases, it’s ok to steal from someone just to fuck up their day. Whoever wrote the question in that book clearly screwed up on their definitions, since there is no ethical dilemma, though there is perhaps a moral one.

Ethics vs. morality aside, the question is still poorly worded, since it is ambiguous as to whether or not we have advanced knowledge of what Hitler will do in the years to come. If we do know, the question boils down to “Is it ethical/moral to do bad things to bad people?”. If we don’t know, it boils down to “Is it ethical/moral to do bad things to some guy?”.