Questions...
1. What are they being arrested for?
2. If you have PC to arrest them now, did you have it before last Friday?
3. If you did have it before last Friday, why didn’t you arrest them at that time?
4. Is the only reason you’re doing it, is to show the people of France and the world that you mean business this time?
5. Given the fact that there have been at least 9 incidents involving muslim terrorists in your country in 2015, are you prepared for mass deportation and expulsions of the savages that have come to your country to destroy it?
6. Do you really think dropping 20 bombs on a location in Syria, is really going to do anything about the thousands that are already in your country waiting to cause you more harm?
7. Is France ready to show the world how to handle these savages(even though Israel does it daily, but they are routinely condemned for it even though they do it right) once and for all by eradicating all symbols of islam from your country?
Israel has not "eradicated all symbols of Islam from its country," has not attempted to do so, and has no plans to do so. About 16% of Israel's population is muslim, and Israel is strongly committed to protecting their institutions.
Also, France doesn’t have he same “probable cause” standards. They have invoked emergency powers which cancels for 3 months many (French) Constitutional Limitations.