I wasn’t thinking on 50 year timescales, more like the last decade. But I may well be wrong even on that point.

fairness matters. Especially as this is a shared planet. Rich people should not be able to monopolize it, nor monopolize political power, have better criminal justice, be treated as better people, and then leverage this monopoly to make people work for them for the lowest possible wage and extract all the value from that labor as "their" profit.

What if one argued that some enslaved people in 1850 Georgia were better fed than before they were kidnapped from Africa. All ok then?

And why should rich people complain if there were a revolution and they were relegated to the middle class? The middle class of 2021 live longer and have better healthcare than the kings of even 100 years ago. What rights does anyone have to anything? By what reason doed anyone have a claim to injustice?

The problem is that unlike poverty and equality, fairness is a vague philosophical category.