And that overlooks that whatever measures would be needed to flatten the income distribution like that would also shrink the overall pie, as in Europe. The fact is that, even accounting for what the OECD calls "transfers in kind" (such as provision of government health insurance) American households have a lot more disposable income than European households: https://data.oecd.org/hha/household-disposable-income.htm (select the "gross, incl. social transfers in kind" drop down under "perspectives").
Americans aren't irrational. The majority is deliberately voting for an economy that produces more disposable income for the top 60%, at the expense of the safety net for the bottom 40%. This feature of the economy is reinforced over time due to immigration. Europeans migrate here to work as programmers, because they can make $500k/year in San Francisco versus $150k/year in Germany. My immigrant mom just came back from a long trip to Australia the other day, complaining how "small and close together the houses were." She said "America is really a land of opportunity. You can get rich here. You can't get rich in Australia." She doesn't care about communities suffering in generational poverty in Appalachia or Baltimore. And she is a party-line Democrat voter!
Because if total salary income were uniformly distributed across the population, the average would be like $80,000 a year.