probably never. in a way, this broadly applicable quote applies: "It is difficult to get a man to understand something, when his salary depends upon his not understanding it!"

80% of people in the US make less than $75k. the idea that people experience diminishing returns on income is a strong argument in favor of redistribution, and is a couple notches more sophisticated than just saying outright that rich people don't deserve what they have. how many people are likely to seriously interrogate the claim that they deserve more than they are paid and/or would use it more efficiently?