I was about to agree with you but then I reread the statement you responded to and it’s:
Yeah fascism really ended in 1945 /s
So your suggestion is to put it:
fascists really ended in 1945
Correct me if I’m wrong, I’m not a native speaker but that’s a weird phrasing. For me it implies (or rather implicates) that all fascists ended because to end is a very strong verb semantically when applied to humans. And honestly, I wouldn’t use it at all.