Is it possible to quantify or even just suggest when someone is to blame for being tricked? It is a common adage that gullible people are to blame for it, even if it is not exactly immoral to be gullible.
A good answer would bring in 'innocence' 'authenticity' 'conformism' 'trust' 'degrees of belief' etc.. I'm guessing that if it is a genuinely reasonable belief, to believe the trick, and most people would do the same in your position, then you are not to blame. But there does seem to be something inauthentic about that equation, to me. Maybe it has something to do with "ideology", and we are to blame when we are unable or unwilling to "think it through"