All these shooters are on prescription drugs that make them go nuts, half of them don't even remember doing or planning the shooting.
The media is "out to get guns" , they are trying to disarm the public as much as possible so that people present more of a threat to eachother than to the establishment (banks, govt, etc).
The other nations are putting pressure on the niaeve executive branch to disarm the american public so that when it comes time for Russia , China and other nations to invade and pillage the Americas they are met with as little resistance as possible (not that they really care since they have people to spare, they just want an ensured and quick victory over their new colony).
I think most self-aware americans will move north to canada or to whatever portion of the country jumps ship and separates (Middle Americas, Southern Middle Americas?) , East and West costs are going to be heavily colonized by foreign powers by my estimates (2020~2035), that is O/C unless the American military and Airforce are hiding some nifty high tech gear that could stop an invasion the likes of which the world has never seen before.
Or O/C no good reason.... nothing could happen, maybe the world will be OK and maybe it will get over its problems.