> This is exactly what racist groups - British National Party - say.

Well, it's true. Don't ad-hominem them, it gives them power (because they can rationally say that you're wrong).

> we should not allow Islamophobic groups to use the Frenh murders to spew their Islamophobe material in mainstream media

I agree. But depictions of Muhammad, insulting as they might be for Muslims, aren't Islamophobic.