I can only speculate, but I wonder if the reason a lot of people shout "tax the rich" isn't that they want a bit more resources for geniunely deserving causes, but that they hate uber successful people and just want to see them "cut down to size".
In this view, higher taxes aren't meant to bring in more revenue (Laffer curves place limits on the effectiveness of higher taxes), but to hurt Rich people. Bring them down so we don't see some people doing 100,000 times better than the average person.
Maybe they think hurting Rich people will make the world a better place? Maybe they just wanna hurt them because they feel jealous? I'm super curious about what the true motives are.
Why are people so unhappy to see the existence of centinares and billionares?
I'm especially talking about people who made their money by creating new things, or made the world more efficient in some way.