Amazing. I often wondered exactly what the term "invincible ignorance" meant, and now I have a perfect example. Anyone who can read a fifteen-hundred-year catalogue of invasions and oppressions and conclude that it was all the victim's fault is totally impervious to facts.
To mention only one example, did you miss the point that the reason there are "different factions" in Northern Ireland is because we put them there?
(I'm reminded of the character who declared in all seriousness that the Troubles could be solved if the Irish Catholics would only "go back where they came from.")