Let's see how the recent migration works out. The present French with migrant backgrounds have had a different sociological history than the new ones will have. And as we saw with the erstwhile immigrants it took two and more generations in the country, before the offspring became terrorists.
Most of our Muslims are French citizens, second to fourth generation. And they are worse than their ancestors. Their ancestors were religious moderates and kept a low profile, their descendants are much more religious, much more radicalized, and most have a militant and proselyte attitude.
We have three problems with them:
a) Strong proselytism, social pressures, intimidation and intolerance.
b) Retrograde cultural influence.
c) Terrorism and criminality.
The French have quite a problem in their midst. And the real problem is that the population is reacting in ways that are less than rational and pressing even moderate parties into rather populist policies to stop the FN from grabbing power.
We have a problem only because we welcomed more of them. The low estimations are 7% of our population, against 5% in UK and Germany, 3% for Canada, 1% for USA. Besides Germany got Turks, who are more often moderate than other Muslims. Note that those stats are much higher among the youth, especially urban youth (a third of high-schoolers in Paris' region), and much higher than the numbers from a few decades ago.
So, now, tell me, what is the smart policy to adopt when your population is divided into two ethnic groups who want different and unreconcilable civilization models? When the minority one is on the offensive to spread its religion and comprises a majority of far-right radicals who hate you and everyone else (Jews, gays, etc), and is radicalizing more and more every year. What do you do when millions of your citizens are now embracing a new far-right totalitarianism called Islam, as part of a global dynamic with many similarities with the rise of fascism and Nazism? What do you do when even your intelligence and moderate politicians start fearing a civil war? When Malek Boutih, former head of the main leftist party, talks about a "radical generation" and warns of a possible massive uprising?
I imagine you think it would be smart to offer compromises. No it is not. We tried that, it produced nothing, they immediately came up with new requests. We have violated our laws for them, our leftist governments even illegally funded Mosques for them, yet ti produced nothing. Why would a further submission change anything? Submission is not a warranty of peace, not even conversion to Islam would be.
"Between shame and war, you did choose shame, you will get war."
There is however one thing we did not try yet: islamophobe policies and strength. Policies aimed to halt the rise of Islam and then make it recess over the upcoming decades. Less Islam, less problems. Maybe they will rebel and start a civil war. Then it will mean we never had the choice of peace anyway.