"It would be wrong and inappropriate to associate the entirety of the Islamist camp with the radicalism of the likes of IS".

Uh, what?

Why on Earth would it be "wrong and inappropriate to associate the entirety of the Islamist camp with the radicalism of the likes of IS"?

The goal of ANY Islamist camp is to achieve a form of theocratic totalitarian rule in which the fundamental human rights of citizens (to speech, religion, press freedom and association) are trampled and obliterated so that fundamentalist religious law based on some interpretation or other of the Koran may be applied with an iron fist, unfettered by the niceties of fundamental human rights.

It actually sounds like a fine idea to lump all the Islamists together, they share the key and defining features of rampant rights violators. That is clearly what "Islamism" is (not to be confused with the words "Islam" and "Muslim").