I'm new here, but I tend to speak my mind, so just ignore me if you don't like what I have to say.
I, too, think that someone thinking they have a right to reserve public land is sort of arrogant. I'd also be ticked off if there were no marked spaces and someone wanted to run me off because I was too close to them. I'm not going to drive around for hours looking for a spot or even worse, not have a spot at all, so you can lord over your little piece of earth.
But then, I'm a loner, so even if I'm forced to park 5 feet from you, you will likely hardly see or hear me, and I sure wouldn't be knocking on your door unless your vehicle was on fire.
I love space as much as the next person, but I'm not going to tell a fellow taxpayer he can't have a piece of something he's paying for.