It is true that acts of extreme violence are less common than they were in the 19th century South, but that alone does not make the system "not slavery" given that a threat of overwhelming force still underpins it.
But you can move stuff out of government reach. If you're wealthy enough to afford good counsel, you can do it ~legally. As Apple, for example, does. Or you can do it illegally. Just don't count on Switzerland or Panama anymore.
And even little people like me can manage it. Using anonymous personas and well-mixed Bitcoin (or whatever). You just can't bring it back to meatspace, without risking deanonymization.
I'll note that "50% of regular Joe's income" has an enormous number of hidden assumptions, all of them similarly socially negotiated. So the theoretical purity of your position is mainly an illusion.
The "high taxation is not slavery, because you voted" argument lost all merit once net recipients of the welfare state became able to out-vote its net contributors - which has already happened in the US.
> make sure old people don't starve
If only that were what the extent of what social security actually does. But it's not properly asset tested. So broke millenials are paying a ton of payroll taxes, which are - after substantial adminsitrative overhead - transferred to their elders who almost always have significantly more assets than they do, and often don't even need a transfer at all, let alone as their only way of avoiding starvation.