I assume that it was one of their cars this time, but I don't know for sure. You may recall several weeks ago when they fastening numerous signs to someone else's car and had to remove it with the guy, apparently a Walter Reed staffer, complaining stenuously to them.
As for your idea, I'm not sure that the vandals would be caught. If you're voluntering your car as a test case, I'd be happy to see what happens. :)
Seriously though, reciprocity or mutuality is a real consideration here since we are dealing with this people every week. Even if one didn't have principled objections to simply blocking their corner with our vehicles (and I would object to interfering with their expression), and one didn't care about the vehicle (e.g., I'd be happy to risk yours :), suppose we blocked their corner with our vehicles. What do we do when they try that same disreputable tactic on us the following week?
Love this. "Lets Roll".
Excellent point. We definitely shouldn't block them. I'm also not sure I'd want to sacrifice a car. I don't think otherwise there would be an issue with parking cars in designated spaces that were on that corner but not blocking their area.
I remember the week they decorated a bystander car.