Ask yourself if the other person would try to censor you if they thought they could get away with it even if you were nice to them, and if the answer is yes it is acceptable (but not necessarily desirable!) to censor them.

That isn't what a DefectBot is. A DefectBot is an agent that would defect in every position, including this one.

For example, the Nazis might do everything in their power to hurt you now (such as attacking you on the way home), and when they are in power (such as, well, I think we all know the canonical example of that.)

On the other hand, they might act nice now but, you suspect, defect when they find themselves in power. Or they might attack as hard as they can now, but be generous in victory. Neither of those are DefectBot.