>>105429696It is extremely easy to get people to fear and loathe a group of people, see Nazi Germany, Salem witch trials, post-9/11 America, apartheid, the list goes on and on.
EVERYONE wants a scapegoat, an enemy tribe to hate. It's human nature. Even the most tolerant of people dehumanize and despise those that are intolerant, imagining them as simplistic strawmen.
Even though relatively few mutants become terrorists like the Brotherhood or go psycho or have accidents, all it takes is a few examples to create hysteria. Look at police brutality and school shootings, which, regardless of your stance on them, are an overwhelming minority of cases; you're not very likely to get shot up at school, but the fact that it happens all the time and is reported on a lot makes it a real fear nonetheless.