There ought to be a clear distinction between indigenous Muslims who migrated post WW2 all the way to the 80s and 90s, and the recent migration waves which outnumber the former. The former have been able to acclimatize to European culture while still maintaining their roots (not to mention that it was harder to migrate back then - you needed a job already for starters). The latter bring the same tribalistic beliefs of their homelands over here. And trust me, the former DESPISE the latter, and it's an understatement. Not because they want to pull the ladder up after them, but because the latter import the same foul culture that the former wanted to escape from.
As a Muslim, I don't want to see people praying on the roads and streets of Paris. I didn't want to see people chanting "From the river to the sea" for Gazans (who have a very strong reason for being despised by the rest of the Middle East). I don't want to see Muharram processions in Barcelona either.
Fun fact, the Middle East has one of the most relaxed migration policies across the world, yet a lot of European migrants are actually unable to migrate because they are criminals back home (the first condition to obtaining a residence visa is a police clearance).
Muharram processions are specific to the Shia community. Allowing one and not letting Sunnis or Sufis do some arcane street ritual/procession is recipe for disaster. Best to not allow anything. Let these rituals be relegated to the mosques and Imambaras, not on the streets where they hamper with the daily lives of non-Muslims.
Indigenous Muslims that you had mentioned are my absolute favorite kind of people, that I've eschewed the rest. The rest could actually learn a thing or two from them (but of course they won't).
