Once again, even with the strict definition I have shown how the etymology could be defensible.There are dictionaries and then there are dictionaries. Not all are authoritative: I'm curious as to what the OED has to say on the subject. In any event, I believe that the definition you were using came from Merriam-Websters:
Main Entry: fas·cism
Pronunciation: 'fa-"shi-z&m also 'fa-"si-
Function: noun
Etymology: Italian fascismo, from fascio bundle, fasces, group, from Latin fascis bundle & fasces fasces
1 often capitalized : a political philosophy, movement, or regime (as that of the Fascisti) that exalts nation and often race above the individual and that stands for a centralized autocratic government headed by a dictatorial leader, severe economic and social regimentation, and forcible suppression of opposition -- Emphasis added. O.B.
2 : a tendency toward or actual exercise of strong autocratic or dictatorial control
As cypress pointed out yesterday, Islamists are not, generally speaking, nationalists. Their ideology is explicitly anti-nationalist, in fact. My position is that this facet of their ideology means that they don't quite fit within the definition of fascism. Authoritarianism, certainly, but not fascism.
I have also shown how new colloquialisms are never otherwise put under such strict scrutiny.
Lastly I have made it clear that new terminology would be unnecessary if new words must match perfectly the definitions of words already in use. If such were a requirement for usage, no new colloquialisms would ever be made. It is pointless to attempt to so statically define new terminology.
I can see making fun of the new terminology, but the attempt to define one word away using the definition of another word is preposterous.