Mass shootings are becoming a common occurrence to the point that the President doesn't even hold press conferences about them now. It took him over 24 hours to even tweet about it and nothing is being done. Australia had a mass shooter in 1996 that led to eliminating automatic and semi automatic guns. They haven't had a mass shooting since but thanks to money and politics the US is just doubling down on everyone having guns. I am all for having a gun for home protection, hunting, or sport shooting but there is exactly zero people in the world that need assault weapons other than military.
For all the people that say the people need weapons to keep the government in check, there are drones with bombs now so if the government really wanted to create a genocide, there isn't anything anyone can do. A random militia in the middle of nowhere doesn't stand a chance if the USA military wants them to disappear. The US military is kicking total ass in Afganistan and Iraq, those are against militias armed a lot better than any person in the US could be.