What to do with Poles in Holland?
Poles are better in-migrants in Europe (including the Netherlands) than muslim groups. They're sometimes involved in petty crime but no terrorism and they go on welfare at lower rates than muslim groups.
Sensible policy that would benefit the citizens of the Netherlands (including muslim ones) would be to drastically limit muslim in-migration as they mostly don't carry their weight.
Religion is considered only as a private matter in France
So it would be impossible for groups to block traffic for public prayer in violation of the law.... oh, wait