How do I short the US government?
If you believe the entire model is intrinsically flawed and doomed to eventual failure, cryptocurrencies if you're technologically optimistic, or precious metals if you're not.
As I'm sure you know, good fucking luck shorting Treasuries. They've been in a 35 year long bull market. As Keynes noted oh so long ago, "The market can stay irrational longer than you can stay solvent."