Most Brits dont understand and find it hard to latch onto. Ive heard a few podcasts that help to understand certain elements - most recently bloody sunday - but I still dont have an overview.
BBC Northern Ireland made some good programmes a few years ago but as far as I'm aware, they were only shown in NI. Dh's uncle appeared in one and we had to go to some effort to find it.
I find it odd, NI is so close and so many of us have Irish ancestry, yet it might as well be thousands of miles away for the interest shown. On a personal level I care, it's basically the reason dh and I eloped because we didn't fancy anyone attempting to right old wrongs at the wedding breakfast. Dh's grandfather was killed by the IRA and at least one of his uncle's is in an Orange lodge. On my side we have some very vocal Republicans. It was bad enough when my mum picked her favourite song (decidedly secretarian in nature, she hadn't thought about the words) and got into a disagreement with mil one Christmas but at least they were sober.
I imagine most people don’t care about any of the horrible things the British Army has done though. A family member of dh's was in Kenya during the Mau Mau uprising, he was so disgusted he left both the army and the country (UK).