Looking at the protests in France, is the problem refugees from specific countries?

Personally, rather than people from a specific country being the problem, I wonder if it's an issue caused by accepting too many foreigners.
Because seeing how Japan is currently experiencing an increase in incidents involving Vietnamese nationals due to the rise in foreign workers,
I can't help but think that when too many people flow in, trouble-makers emerge and cause problems.
Or is it truly that Muslims are the problem?