I think you'd benefit if you took a view from a different angle. This isn't about a "2nd Amendment issue", this is about freedom and how those groups do nothing but limit it. Those folks either couldn't find success in government, or they are practicing for their next attempt at it by running their own little kingdom.
It certainly sounds like you support the HOA's restriction on the neighbor in question's rights. I can't see a bit of difference in what you said, or if the same guy went to the State of Colorado and applied for a carry license and you went strolling in and said, "Ummm, are you sure? This guy is a hyper-emotional person who butts heads with everyone he meets."
You may have plenty of opinions about the people around you, and that's fine... even normal, I'm sure we all do. But you support encroachment on personal freedoms for your own agenda and that seems short-sighted and horribly self-centered in the way you've described it.
Imagine if your HOA could restrict your internet access because a neighbor pointed out to them that you snark about them on a discussion forum? And please don't read that and write it off as a snotty remark -- I'm trying to make a point. Your neighbor might be precisely as you've described him, but that's a personal opinion and a lousy, awful roadblock for an American to do as he pleases on his own property as long as he's safe & respectful to others around him.
We've got HOA's around the area I live that (no, REALLY) have rules in place regarding how long you may have your garage door open, how long a guest may park a car on your drive or on the street in front of your house and things of that nature.
That's ludicrous.