There were a lot of antisemites and fascists in the early 20th century. Hitler didn’t act alone; he was the demagogue who got fascists into power in the most developed industrial nation of the time.
AskHistorians
No because Mussolini is the most known for facism
If by some miracle the SDP pulled off a surprise victory and righted the floundering ship that was the German Weimar Republic, we'd probably discuss evil in terms of colonialist or Soviet atrocities.
Fascism is a very easy target for condemning authoritarians, though - if you ever read the Doctrine of Fascism, it's really quite open about crushing the individual in service to a singular will in control of the fascist state. We'd probably still be calling people fascists for being authoritarian shitheads - we'd just probably use a broader term than 'Nazi' ('genocidaire' is my vote, but it's also a bit of a mouthful) when casually referring to immense evil.
Stuff like that inevitably happens under capitalism, where ever-escalating sociopathy in treading on your fellow workers rewards you with more money/power.