If those historical facts are undisputed, why are people disputing them?

The people deciding for themselves has not perpetuated the status quo.
It has put Sinn Fein officials in offices of state, and brought about weapons decommisioning by all the main paramilitary groups.
Only a few history obsessed loonies are still running around with guns and bombs.

The British Government is not committed to military intervention, and there is no military intervention.

For someone who is not interested in borders, you have shown a huge and emotional yearning for a United Ireland.
It is not my fault that it is not wanted in Ireland.
I wish it was.