Simply because Britishness is a political and syncretic identity. The main problem is that the nationalism that the British Identity was built upon: Acts of Union, Protestantism, Empire and a fear of a foreign threat (such as France historically) etc. have largely declined. Note all the immigrants have spent their lives being told they're British rather than English or Welsh or Scottish. Being white is only half of being a ethno-nationalist, you must first and foremost be a nationalist, and that means allegiance to your own homeland above all others.
The main positive I could see from all this is at least rekindling some kind of English nationalism which is far less cucked than the British globohomo identity. Scottish nationalism barely exists and is not to be confused with Scottish secessionism. Welsh nationalism exists only during international rugby tournaments. Irish nationalism is the manifestation of small country syndrome and the desire to differentiate from the English.
And Irish Catholics don't have a hostile ideology in any sense? Every war Ireland has ever fought against England has been for the sake of making sure a Catholic, a foreigner, or both is in charge of England. Whether to invite the King of Spain to either become King of Ireland himself or send one of his family members, with a view towards an eventual conquest of England (Flight of the Earls), or for fighting to restore the King of England to his throne because he was Catholic (Williamite War).
Throughout the 18th century there were various plots by Irish Catholics to coordinate attacks on Britain with France, there was a whole regiment of Irishmen serving the King of France. The Irish rebellion in the beginning was also made up of a very, very small group of terrorists. People like the Cuban-American de Valera fucked the whole thing up because they wanted a Catholic Republic, not a free Ireland. Now Irish nationalism devolved into civicuck nationalism pretty quickly.
Popery is fit only for the barbarous peoples across the Channel and the Rhine.
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