No, I'm supporting the vet's freedom of speach/expression, and actions speak louder than words.
...and are opposed to property rights as they are advocating theft of flags.
No, I'd consider that a "rescue" not a theft. I'd probably have burned the Mexican flag though...
I fail to see in the Constitution where any one citizen has greater First Amendment Rights than the next citizen.
However, theft is theft and it does not matter if one steals a car or a flag, it is still against to law.