I'm not sure what they're really trying to accomplish. They're shoving their political opinion in everyone's face. Quite often, however, people like this end up generating a fair amount of animosity towards their cause and bring together opponents trying to stop them who otherwise wouldn't have enough ambition to do so. Their actions end up being counterproductive. I'm not sure why they insist on hurting their own cause but they're hell bent on doing it.
Many of us who enjoy responsible recreational and sport shooting really wish these idiots would shut up and go away because they bring unwanted attention to the subject and end up making it more difficult for the rest of us.
I think I'm finally starting to get a handle on this mindset. By "pushing" their agenda, they want to force the other side to push back. Presumably, then, they can say to all the other like-minded enthusiasts "Look, we were right, they are trying to take our guns!" In other words, they're launching a war because they think they have the numbers to win, if only everyone on their side would 'wake up.'