I don't think most folks think very hard about where most wealth comes from but imagine it just sort of exists in a fixed quantity or is pulled from the ground like coal or diamonds - there's a fixed amount of it, and if there are very rich people, it must be because they took the coal/diamonds away from other people who need it. This leads to catchy slogans.
But it's pretty obvious wealth can be created and destroyed. The creation of wealth comes from trade, which generally comes from a vibrant middle class which not only earns a fair bit but also spends it. Wars and revolutions are effective at destroying wealth and (sometimes) equitably redistributing what's left.
Both the modern left and modern right seem to have arrived at a consensus that trade frictions are a good way to generate (or at least preserve) wealth, while the history of economics indicates quite the contrary. This was recently best pilloried by a comic that showed a town under siege and the besieging army commenting that this was likely to make the city residents wealthy by encouraging self-reliance.
We need abundant education and broad prosperity for stability - even (and maybe especially) for the ultra wealthy. Most things we enjoy require absolute and not relative wealth. Would you rather be the richest person in a poor country or the poorest of the upper class in a developed economy?