First, all the recognizable veteran biker club members present at Twin Peaks weren't even arrested, and in one case were released once their proper affiliation was sorted out. Members of a number of other MCs who were present that day flying colors were not arrested either.
Second, there is no indication among those who were arrested at Twin Peaks that there was any significant percentage of veterans. In fact I'm willing to bet there was a greater percentage of patriotic veterans among the law enforcement officers present at Twin Peaks than there was among the bikers who got arrested.
Given hiring preferences in the age of militarized law enforcement, you may be right.
That still doesn't justify tap dancing on the Constitution.