This is simply wrong. Many of the worst mass shootings in the last decade were committed with low power rifles and handguns. I’m actually pretty sure the two worst mass shootings (by count of those who were killed) in the US were done using .22 ammunition. Those weapons were not covered by whatever ban you’re talking about
It’s not about “assault weapons” and it’s not even about guns. It’s about the inability of our government to pass meaningful legislation around gun ownership and mental health and especially where those two topics intersect
The problem is that human suffering is normalized because the wealthy political class and those who fund them are not going to let things change for the better if it means less money for them.