Talking about being the richest country in the world is pretty irrelevant, even the rich will eventually run to the end of their money and the UK has done so ,This isn't a "last government" thing they have been scraping the bottom of the barrel since Blair at least, with governments propping things up by borrowing from private companies, selling of assets, and now there just isn't anywhere else to go.
And actually most other wealthy countries are facing the same things - their tax base is tapped out and they don't have enough to cover all the costs people would like to be covered. Whether you are talking about social housing or social medical care, or people having more money in their pockets and paying privately, there just isn't enough money for all the demands.
The wealthy are already paying a massive proportion of their earnings in taxes and asking for more will likely not result in much more return because they will either move away, or reduce their earnings. in the more socialist countries like the Nordic nations, it's the middle and lower middle classes who pay more taxes, but here those are the people who are already feeling the pinch and they simply won't put up with it.
The only real way to increase the tax base witll be increases in productivity but they haven't managed to crack that nut and so far there are no signs they will.
Of course it's not the fault of anyone who has come from elsewhere what the state of governance here is - no one thinks that and talk of "fault" is misplaced, and tbh I think it's manipulative language.
The matrial reality is that if there are 100 houses, 150 people looking for them, and then the state approves 20 new migrants to come and work, you now have 70 people out of a home rather than just 50. And the people who live here, are citizens, are thinking, wtf is going on that these other people are being given priority over me? That's not about social housing either, btw, it's about the fact that on the private market 100 homes will still not do the job for 170 families, and the more families that are competing the more scope landlords have to up rents or be picky about tenants. And who ends up suffering in these cases - the people with less money to spend, who tend to be more economically and socially vulnerable.
Accusing people of blaming migrants personally is just so massively tone deaf and disengaged from people's real lives, it's really no wonder it's fuelling racial and ethnic disharmony. But ultimately it's a class issue - it's the vulnerable who suffer when migration policies are unbalance, but the pmc typically benefits, so of course they want it. And shut up the vulnerable by accusing them of racism.
Well, now they can see what they've created. And the response, often, is just to feel superior. It's gross.