I doubt they see it as just silliness on the net
"They" do not just see it as internet silliness. Unfortunately, "they" see it as a reason to do all the things we are trying to prevent. "They" see the radical ranting as a reason to restrict guns even further because of the radical, unhinged people that seem to be leading/populating the gun owning community. Sadly, the "they" in question is the general population and not some black-ops government agency.
This type of behavior falls under the "self fulfilling prophesy" category.
Like I have said in the past, I have tried to initiate many friends to this forum. They have all decided in the end that they do not want to be associated with such nonsense after reading a lot of the radical posts.