My pet theory about one of the factors that lead to the Brexit side winning the referendum was that anyone who expressed any concern or worry about immigration was immediately shut down and branded a racist or bigot (by the likes of Gordon Brown and the press).
It therefore became a taboo subject and so anyone who didn't think immigration and multiculturalism was a great thing or had any doubts learned to keep quiet rather than challenge the mainstream orthodoxy. There was a lot of simmering resentment as a result and and it was only when the Brexit vote came along they were able to express themselves in the privacy of the ballot box
No-one in power really took the time to explain the benefits of immigration, or to discuss the negatives, and it was easier just to say how awful those who questioned it were than the to win an argument on the actual issue they raised.
It looks to me like we haven't moved on very in terms of being able to have any kind of rational discussion of the pros and cons of immigration.
Since you brought it up. It is a good thing that people are finally coming round to being ready to admit to themselves, that their vote for Brexit was indeed exactly what it was claimed to be all along.
And that is, somewhere between just plain underlying hidden racism or bigotry, and what you would argue is just, let's call it, intellectual anti-immigration.
Those kid-on economy, fair trade, better opportunity etc reasons claimed, really were largely for many there to distract from getting into a discussion on immigration, for the very unfortunate reasons you point out. People will of course continue to argue that as individuals, but countless surveys since show that for the wider numbers.
And you are right, we haven't really moved on. And we probably never will or can, because it will always be seen as a bit taboo.
Partly because, you are right, people are quick to point the finger and quickly double down, and it becomes unpleasant.
And partly because, weeeellll, taking it on yourself to decide who should have what rights, can or can't work, live, move, have access to healthcare etc; based entirely on where they are from, does at the end of the day just inherently share underlying principles with, well racism/bigotry.
The sad outcome is though, we have not in the slightest changed the immigration issues with Brexit. But have managed to fuck everything else with it, the economy, our movement, healthcare, farming, fishing, education, the state of the union, and our general future. Just like it was said we would. With obviously covid and the wars piling on for good measure. While that division is still there, and at a political level has become even more extreme, with resentment still bubbling away in the background.
What the hell it will take to start pulling both sides back towards the middle I really have no fucking clue. If extreme events like a pandemic and wars can't pull people together, fuck knows what can.
Back to Dublin, as we have seen here ourselves, it is one fucking slippery slope, when people who would otherwise condemn these riots, start to present them as understandable, start to argue terminology, start to deflect to other problems or whataboutery, just because they have started to feel 'disenfranchised'. Someone somewhere will find a way to quickly capitalise on that, and it will take people years to come to terms that they were simply used. Admittedly the problem is already there and far more advanced than most of us here were aware of, and these events will only further exasperate that.