Note: Possibly Mindkilling In Ireland, antifa is pretty small, but seems to be closely associated with radical republicanism - which has a specific meaning in Irish politics: Sinn Féin and other more millitant nationalist groups, generally left-leaning (or appearing to be to gain popular working-class approval) and often anti-British. This leads to the odd situation where antifa is closely correlated with nationalism.

From a communications clarity point of view, I like that there is a word for certain failure modes of far-right ideology, in the same way that I like that there is a word for certain failure modes of far-left ideology. Using the far-right failure mode label for those on the far left confuses this distinction. To me, the defining feature of fascism (or communism) is not use of private, politically motivated violence with the tolerance of the authorities. That's bad, but it's not the reasons that I think fascism is bad. It's similar to the problem of saying that Nazism is bad because it is socialist ("National Socialism" in the name). Nazism is bad, and socialism (as those speakers intend the term) is bad, but Nazism != socialism.