PoliticsNerd Firstly, I do not agree that we should accept the excessive and ever growing wealth of the extremely wealthy. I have long been interested in 18th and 19th century social history and I've seen for myself primary sources which show the immense inequality between those at the top and those at the bottom. The 20th century began to redress that with (for example) socialism and universal suffrage. It does seem that the tendency for more equality is being reversed. I don't accept that as a good thing for individuals or for the kind of society which I think most of us really want. The big question, of course, is what can be done about it, especially given that most people want to hang on to what they have and (as we have seen with Musk in the US), money buys political power.
I expect you'll nitpick here, but I'm going to ask who exactly you mean by those on middle incomes. Income distribution follows a classic bell curve with the vast majority of people having an income somewhere near the middle of the curve. There is, in fact a very long tail at the top. I'm not sure what the lowest threshold is to be in the richest 10% in the UK, but I know that my partner was (until his recent retirement) at the bottom end of that 10%. His income was far nearer the median of all people than it was to the richest 1%. He has far more in common with the "middle" than he does with the mega-wealthy.
At the other end, my own income is in the bottom 10%, but I cope - maybe frugally and I'm sure many GNers wouldn't like my lifestyle, but I survive (I have food, a roof over my head and a warm home). I accept that there are people who really don't have enough for the very basics, but there aren't many of them. I conclude from the statistics that probably over 90% of people are in the "middle".
After the boom years, the UK is in a mess. Our infrastructure is crumbling and our economy is stagnant. As a country, I don't think we've adapted well to an ever-changing world. It's not surprising that the "middle" is having to pay for it because the "middle" is nearly everybody.
Compared with 50 or 60 years ago, our lives are generally more comfortable. However, what seems to have happened is that there has been no planning for the future and change. In simplistic terms, we've lived on credit and people don't like having to pay for years of neglect. The "middle class" makes up a greater percentage of the population than it did half a century ago. It really isn't surprising that they're seen as being hollowed out. They are the majority and the country as a whole is in a mess. People squabble amongst themselves over a few pounds - and have taken their eyes off what's happening with the 1%. I don't know where you got the idea that nothing should be done about them. Personally, I'd like to see them hammered and not be taken in by arguments that they'll move their money elsewhere. Most of them have their money squirrelled away abroad anyway. We should be asking the question how much their money benefits the vast majority of the rest of us. I suspect it's much less than people are being conned into believing.
Lastly, I don't know where you get the idea that younger people accept the status quo. The ones I speak to most certainly don't.