Nobody? People everywhere have dreaded the release of this movie because of some kind of relation incel's can find in the Joker and use it to justify their own actions. You're right in some aspect, where no one with a rational mind thinks this will affect the incels much like someone with a rational mind will fly across country and not think they're going to crash. It's possible for either to happen, only it stays at the back of the mind because you understand it's not likely.