Ahh, the good old trickle-down, aka "piss in my eyes and tell me it's raining" (which is the only way trickle-down actually works). It was pure mythology from the start; there's never been any basis for it to begin with. It's a pity we even have to debunk it like that. Go figure, give a million hungry people $20 each, and see $20M return to the economy the next day as they spend it on food. Give a billionaire $20M, s…
Europe has substantially higher taxes and cost-of-living than the US, but lower median, PPP-adjusted median, and median post-tax post-government-transfer disposable incomes than the US.
When you compare countries by their tax rate compared to what the average (median) citizen ends up with, it does not seem to be the case that higher taxes result in greater personal financial security. Frankly, whether lower taxes results in more billionaires is irrelevant to the question of whether it increases the quality-of-life or economic security of your average person.
Imagine pointing at one of the richest societies to ever exist (across all quartiles) as an example of how bad its economic policy is.