The European Union wants to maintain its authority as a super government over the member states. Like communism you vote your way into the European Union but you have to shoot your way out. What the European Union government is doing is installing enough immigrants with no connection to tradition and custom of the member countries to provide enough popular support to maintain their authority. They do this all over Europe. There is a seemingly endless supply of Muslims from the Middle East to fully populate every member state of the European Union. Combine that with the entrenched bureaucracy that will support the European Union, the native population has no choice but to accept their position as serfs or to leave. There is no fighting back after it has gotten this far.
The Irish Catholics of Belfast did not lack for fighting spirit.
The problem with that theory is Brexit. It took a long time but the European collective lost the UK. In spite of that UK politicians are still insisting on support for the invasion.
I figure it is similar to the incentives for the Biden coup's Great Replacement invasion over here. Replacing people who work for a living with those who vote for a living.