Despite the fact that MASS shooting is on the rise in USA, there is very little USA government is doing to stop these MASS shootings in future. Joe Biden too not very much in favour of gun law that let anyone buy a gun hut still there is no legislation from federal government.
So what you're really asking is why authoritarian restrictions aren't being passed against the popular will of the people *and* the supreme law of the land in a representative democracy.
Common sense gun laws aren't authoritarian restrictions.
Common sense gun laws should be viewed the same as a drivers license or medical license...
I didn't realize having your kids shot at school was "the popular will of the people"
I'm just happy to live in a sane country.