But sales tax still works for that, since if you want to buy a Ferrari we’re keeping 20% automatically at the point of sale.

Unfortunately, that is very easy to circumvent. Rich people usually own companies which made them rich in the first place. They can easily buy cars in the company name and write not just the VAT off, but income taxes as well.

As much as I understand us military, they are required to follow all orders (like any military, really) except orders that are illegal.

So, if Trump ordered an invasion of Greenland, the military should refuse that order, unless that order also comes with an act of congress declaring war on Greenland. However, Nixon bombed Cambodia without a declaration of war, so I don’t know.