It eliminates your exposure at the cost of ~25-35% (depending on where you live and potentially up to ~45% if Biden's plan passes), so it only makes sense if you're certain that the market will drop by more than that.
No it doesn't. Eliminating the exposure would mean your net worth would stay the same regardless of whether it goes up or down. That's the case if you sold your bitcoins, but not if you took out a loan.
The point of a tax is to redistribute the money a government thinks should be redistributed to account for externalities in the market (and support social / infrastructure programs).
> The point of a tax is to redistribute the money a government thinks should be redistributed to account for externalities in the market
That is not the point of a tax. The point of a tax is to raise revenue for government programs. That includes bombing children on the other side of the world, financing explorations to space, bailing out boeing and goldman sachs, etc. Nowhere in tax law does it say "redistribute to account for externalities in the market". Just because you dream something ought to be so, does not make it so, now or ever.