There is no clear or simple answer as to what ails America. It's a combination of factors but one of which seems to be the perceived loss of favoritism and position as top dog in the social-economic hierarchy by the current occupier of that position.
And while the 2nd amendment guarantees our right to keep & bear arms the unspoken caveat is "for all lawful purposes" which a lot of people seem to forget. And because we cannot arrest people before they actually commit a crime, at least not prior to the U.S. Patriot Act, and because our laws don't prevent crimes only prescribe the punishment for violating them, we're left with only punish, which in most cases doesn't come close to fitting the crime of depriving a person and their loved ones of their life.
Take this guys for example. The police were attempting to serve him with an arrest warrant for domestic violence and he was just not having any of it. They did ultimately arrest him but only after he killed two of their officers and their canine. Another officer later died, bringing the total to 3 + their canine who is also considered an officer.
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It always amazes me that the police can manage to take into custody a stone cold killer, without shooting him and without him losing his life as long as he's not black.