in what way is thieving 70% of someone's income worthy?

bunch of thieves.

If you can produce income in the wilderness without any aid from society or any interaction with other humans in any way then I would say you're entitled to not be taxed. Otherwise we all owe society for what it's provided to us and taxation is a morally upstanding concept.

I know you're making the point that just about everyone should be taxed, but to make your argument even stronger: a wilderness-liver probably has equipment (including clothes, shoes), knowledge/skills discovered/invented by others and learnt via others, and was raised within society. There may be a counter-argument for some knowledge/skill as a sort of "human heritage", like language, general knowledge, arithmetic, that isn't itself created by the state or this state (though its transmission may have been) and shouldn't be taxed.

I have some sympathy for this fellow.

EDIT also, there's no reason collaboration with other individuals should necessarily attract taxation. Human collaboration predates all states.

1) Not thieving. Jesus Christ.

2) Ocasio-Cortez brought up a 70% tax on income over $10,000,000. Literally no one is seriously talking about taxing a straight 70% of anyone's income. Except for the people who are trying to confuse you into misunderstanding the facts.

The angry characterisation of taxation as theft with no further comment is lazy and disingenuous, at best.