I am not quite there yet, but I am heading in your direction.
Islam thinks the West is weak.
They think that they can both decry freedom of speech to "insult" their prophet while exploiting our freedom of speech to make terroristic threats.
It is up to the West to make clear in a most muscular manner that such a dichotomy is not only hypocrisy, but criminal. And that those who are unwilling to at least co-exist with the values of their host countries are no longer welcome there.
The West can still make that condition, and I see signs that the West is realizing that this is a stand that has to be made.
And if the West is not willing to make that stand, then the next step will be a defensive step like you postulated.
This is the opening salvo of that battle.
Why the MSM and the western govt. called them War criminals and ponded them.
Why on this very forum today there are folks like hoplite and LS condemning the Serbs for fighting islamics.