I understand your point about Slavery and Income Tax, and to some extent agree with it.
However, taking the analogy literally requires ignoring the true horror of chattel slavery. Nobody is enslaved by taxation in the USA. Since raising rates generally results primarily in additional legal (and illegal) tax avoidance, nobody is likely to be enslaved in at least the near future.
Let’s assume a person in this country with income of $1M being taxed at some future point at 80% of his earnings. I’d agree that’s way too high.
But it leaves him $200k to live on, which can be done quite well. The guy is overtaxed, not enslaved.
Sure, he can live on it. But since he can no longer afford the luxuries with which he's rewarded himself for his hard work, why bother working so hard? Down goes productivity, since it is punished anyway.
Taking my analogy literally only involves using the terms defined. Slavery = being controlled by another; to work (forced) for the benefit of someone other than themselves.
I would have little to bark against if taxes were to be paid for those things on which gov’t has every right to be paid FOR: fire, police...I’ll even add roads (but we did fine until the 1920’s w/out gov’t ‘paying’ for roads). The slavery DOES come into play when I/you/we MUST pay for schools, ex-gov’t ‘bennies’, welfare, SS, mediXYZ, foreign aid, Dept. of XYZ.
Lastly, you presume two things: 1) the gent CAN live on $200K/yr (New York, L.A., etc.). Even if he wanted to party all day, buy a McMansion; is his property not his to piss away IF he wanted too?? 2) 80% isn’t ‘enslaved’ per the guy being robbed. I highly doubt ‘overtaxed’ != ‘enslaved’ in his mind.