Of course we make decisions for the masses. Do we want one person to have the fire power that when he snaps he can go out and kill hundreds of people? No we do not. So we are going to make decisions that are good for the masses. Sorry you don't have the FREEDOM to commit mass murder. Or you still do but you're going to have to use a car or bomb. And if you decide to use a gun you'll have to reload after 10 shots. That'll give us some time to run away from you or tackle you.
To be honest, as Leftist policies have become more prevalent, the violence problem has increased.
In early America, school children routinely carried loaded guns to school. Yet "mass shootings" did not occur. What changed?
Unfortunately, Leftist policies seem to encourage "victimhood" and a lack of effective criminal and mental corrections. Which leads to a decaying society as we are seeing today.
Finally, the unfortunate truth of the matter is that in EVERY free society, unfortunate events like mass shootings are occasionally inevitable. It goes with the part of being "Free".
But similar events occur in non free societies as well. China has mass killings frequently, but usually it is suppressed in the news and those involved dealt with swiftly and removed from society quickly. .
Do you prefer to live in a free society where you can basically do and speak as you please, but be subject to occasionally mentally ill people who can do horrible things like buy guns and kill innocent people?
OR......
Do you prefer to live oppressed and tightly watched and dictated to by a government that does not allow you to voice your opinions or do as you please in the hopes of being "safer"? (Notice I said "hopes". Because in such a society, the government can arbitrarily take your life if it so desires with little or no cause or justification. Cuba is also such a society.