Just to be clear, you're just referring to the ones who blow people up, yes? Not everyone who follows Islam?
Because, in the case of the former, I absolutely agree.
Interesting bit in the Wikipedia article for Islamism which pertains to the use of the word 'Islamist' by the Associated Press:
The Council on American–Islamic Relations complained in 2013 that the Associated Press's definition of "Islamist"—a "supporter of government in accord with the laws of...
I like the immediate assumption that A) it's terrorism and B) it's an immigrant. Always happens.
I tend to go with "probably terrorism, could be homegrown, could be from elsewhere, best wait until the facts come in before running my mouth off though, sensible"
Best of luck to the injured...