Individualized justice under the rule of law has no meaning to tribal peoples. When a tribes kills or rapes a member of a different tribe, the response is communal, it must be if one is to secure a balance of terror that secures a modicum of social peace.
The failure of a communal response is understood by the aggressing tribe as a kind of consent. Western Europeans, long ago subdued by systems of individualized justice and rule of law, have largely relinquished the collective instinct for such conduct. Having imported tribal peoples from the dark and backward corners of the earth en masse, they effectively acquiesce to the mass rape of their own daughters. This would be true even if Western European criminal justice was swift and decisive rather than constrained by a mind virus that has judges forbidding the deportation of rapists to their home countries in deference to the human rights of the rapists that turned police into active collaborators in the gang rape of British children for decades.
Northern Ireland is a small pocket that retains some of its tribal character and capacity for communal violence. The way to preserve Western Europe as a place beyond tribalistic hatreds and violence was to keep out those who would not live by the same law governed protocols. Having failed in this reasonable and moderate course through the fecklessness of its political elites, now some degree of reversion to practices drawn from Europe's tribalistic past seems already baked into the cake.
Belfast, Ireland, is on fire right now.
Vigilantes are going around evicting migrants from the HMOs and setting them on fire. They are setting up checkpoints on the road to catch migrants and setting their cars on fire. The police are overwhelmed, and the anger among the populace is at a boiling point.
Things can get ugly when Northern Ireland's law enforcement loses its monopoly on enforcing its rules and the vigilantes gain de facto power.
All of this started when a Sudanese national who was allowed to stay with no legitimate background checks attempted to behead an Irishman. Northern Ireland is not unfamiliar with "The Troubles" and chaos, and if there is an area that is willing to go all the way, they are it.
... and the thing is. This is still the moderate outcome so far.