Back when the war2 was still visiting the poor sods in their dreams who served in it, I was employed in a workshop complex populated with them. They were from everywhere Europe and they had that old skool distrust and hate for their work mates; all except for the Brits who kept their friendly rivalry between themselves and above those from across the English Channel side. Oh there was the Italians who just always seemed friendly, happy, polite and so grateful to have a new place to call home (wonderful people the Italians, by and large).
Even back then we were importing damaged people who had unresolved issues and generational hatreds.
It was rather a shocking thing for me to see the tensions and eruptions and the vulgar language only cemented my disdain for them and their primitive behaviours. None of them were Islamic as I recall, but supposed Christians, dispossessed of their birth rights.
It was the Australian tough nuts who had also seen and done things in the war they wouldn't talk about, who showed the way by letting it be known that if things continued, things would really get ugly and the protagonists better shake hands and act politely to each other or else.... no police, no specific legislation enacted, just peer group pressure to do the right thing, i.e. "don't s4it the mob".