Posts on Facebook are very easy to monetise, more so than on other platforms, and lots of "likes" and reactions on a post coming from the US/UK generates more than lots of likes coming from poorer countries. Basically because advertiser's will pay more for Western eyes. Because of this, posting things that get the attention (negative or positive) of Western Facebook users is a fairly lucrative career for people in countries with lower wages. Eg Pakistan, India, Sri Lanka etc. This has been the case for a while but AI slop has lowered the barrier of entry and made it easier to mass produce. You don't need in depth knowledge of the social issues annoying UK people, or how to make it realistic. You can just fire a load of things at the wall and zero in on what is popular. AI does the hard work of making the image look realistic. You don't even need to speak good English anymore.
Of course you can generate clicks in lots of ways - heartwarming shorts of kittens saving puppies from fire etc. But stuff that makes people angry gets more attention. And stuff about migration/benefits gets attention from both sides -peoole saying they agree and also being angry AND people saying this is nonsense. Attractive young women also get more clicks. And AI AND the slop farmers learn from other things getting popular so you end up with very repetitive posts. And if one thing is doing well you repost it multiple times with slight changes so you get different attractive ladies saying the same thing.
Add to that the fact there likely are people trying to put their thumbs on the algorithm to push a particular narrative and you get what you get. The irony is the people posting this stuff often don't care themselves but if it's more worthwhile to post racist stuff they will. Which then leads to the odd scenario of people in far away countries, often themselves Muslim, generating masses of content about how foreigners and Muslims are a problem so as to make an income from white British "patriots" who hate foreigners.
It's a strange world.
ETA: it's not just people in other countries. But where wages are lower it makes more financial sense as a job/side hustle than in the UK. To grift in the UK you need to build a public persona really the AI vids alone won't generate enough