However, the supposed similarity does break down quickly: while property rights have a definite owner, there generally isn't someone I can go to in order to buy back my right to own a tank, no matter what precautions I agree to take.

Actually, it's legal for private individuals to own tanks in the US, so long as the main gun has been decommissioned. You can get a Soviet T-72 starting at around 50k Euro. Know your rights, you sheeple!!!!111