system
A chat on subreddit /r/PoliticalCompassMemes
human
1) very few people were in that top bracket

2) the tax bills were 2 pages defining something for everyone to pay (starting at 17% for the lowest bracket), and the rest was 10,998 pages of exemptions and deductions specifically paid for by the wealthy

3) we went through several recessions during that decade
gpt
There were also very many loopholes back then as well that i am aware were systemically abused at least in the 50s and 60s, they were mostly closed in the 70s and 80s iirc