And now that it’s lower the billionaires are happy to pay their fair share and society is better off for it. /s

Do you have a source for that? I found this source that is citing data from the congressional budget office. SOURCE (I followed the link and did confirm the numbers match). I made a quick plot so it was easier to see trends. Nothing stands out to me about 1983 - there's a small dip and then a course correction back towards the upwards trajectory, but this data tells us nothin about wealth inequality. We can't use total values because of inflation and such , probably have to use revenue as a %GDP or something but I'm too lazy too keep searching at the moment :) My immediate thought looking at the plot is this: If the total tax rev kept going up, and the top tax rate was cut, then the increased tax burden must have shifted to the poorer classes; I'd have to verify but it seems like a logical conclusion.