"The basis of the Irish troubles was Catholic/Protestant hatred."
They hate each other because the Protestants, who were brought in from Scottland, supported the British Crown, who shit on Ireland for hundreds of years. Originally, people didn't like being moved off their land and treated like 2nd class citizens in their own country. Then over the years they just kept hating each other because they were already fighting for so long. Nothing to do with actual religious ideology.
It was really a classic British Empire move. They turn one local population against another to make it easier to control both. If there aren't two populations to turn on one another, they import one. They invited all the Jews into what is now Israel to make the Palestine easier to control back in the day too.
"As for nationalism, there is a Catholic run Ireland. (Personally, I think the RAF should have turned its sites on nazi-supporting Dublin after WW2, but what you gonna do). "
I can only imagine what you're referring to but based on the rest of your post, I'm sure its some biased nonsense. I'm sure some Irish saw the Nazis as an opportunity to get rid of a long standing enemy but the country was neutral in the war and plenty of Irish fought for the Allies - many in the British army in fact. I've never heard of any Irish joining the Axis forces.
And there would have been no RAF or Britain after WWII if it wasn't for the large number of Irish-American GIs who save their asses, BTW. If the Brits would have attacked Dublin after the Americans bailed their asses out, we would have crushed those fuckers and deservedly so.
"The idea of the "liberation" of NI from an "oppressive" invader by a bunch of murdering criminals is no different that that of the Iraq jihadists and taliban."
Nowadays this is true. Its been put to a vote and the Republicans lost. It is also true that Ulster militias are currently more active and more violent than the IRA.