Yeah, that's kind of the thing, I guess.: once in a blue moon an actual fascist pops up, kills dozens of people, the world is shocked, and massive reforms come in so it can't ever happen again.
Another Islamist goes on a rampage? Oh, it's just a Tuesday. Change anything? Nah, just bring more of them in.
And if we're going to discuss the "imminent threat" of the right/far-right/ze Nazis (read: literally anyone who doesn't want to have their daughters gang-raped my migrants from backward countries) that we're constantly having drummed into our heads, out of the 43000 individuals on MI5's watchlist in the UK, 39000 are Islamists - that's 90.6%. They only make up 6.5% of the population (according to 2021 census stats - probably doubled by now). Ze Nazis fall into the remaining 4000 with the rest.