The problem is words morph. Especially when comics like the Sun & Star get hold of them.
An extremist to me would be someone practicing violence. Anyone advocating violence would these days be dubbed so, but in reality would be a seditious.
Even then I would think think it should be reserved for terrorism.

But such is the nature of things anyone in favour of the death penalty might get the accolade.

Words often mean what people want them to mean. Hence we have divided nations in the UK (& US and who knows where else).

And there is a word factory (or did I mean fake tory?) in the White House.