Don't you think it's a bit strange that the biggest risk to your wad of $100 bills, as you drive down the highway, is not criminal robbers, but the police?
However, protecting yourself against something like this doesn't have to mean that you think it's a reasonable and justified action. As I explained earlier, for the same reason I generally wouldn't carry this much cash around, I don't leave valuable items inside my locked car, even though it is illegal and unjust for someone to break into it and steal them.