How would you suppose such a violent confrontation would take place? (BTW, I think you're right, I'm not challenging you). Let's just restrict it to one scenario, say, that might transpire in France. And let's just assume that the violence, rioting and car-burning that occurred last year there has continued to fester and sporadically break out in less dramtic ways since then (it has in fact.)
The only difference for the riot-ready Muslims in France will be HOW THEY WILL BE DEALT WITH by any new French President, not WHETHER THEY WILL CONTINUE TO DO WHAT THEY WANT TO DO. It may come down to the POLICE being given free reign to defend the country and THEMSELVES in a situation even more out of control than the recent one.
If France wants to go through that, that's their own business. It would be much easier for a new government to get laws passed that would enable it to DEPORT the real troublemakers back to their countries of origin.
I think this would be a logical first step and would solve part of the problem. However, many of the troublemakers are native born citizens who will have to be confronted by all resources available to the government, including martial law and the military.