No matter how it looks, he certainly proved a valid point: Texas is a police state....
I don't think he proved anything, except that he's an inconsiderate jerk. As many posters in that link pointed out, the 30 MPH speed limit suggests he was in a residential area....where children play and could dart out into the street.
After getting caught for exceeding the speed limit by nearly a third, and having his peers confirm that his choice to speed was wrong, he decided to act childishly and take his frustration out on a civic employee.
Perhaps I was wrong to say that he didn't prove anything. He did. His actions and the posters' responses confirm that you can publish any nonsensical position on-line and get lots of people to buy in, while others see through it.