It's not the guns...it's the drugs.
Yup, not only for mass shootings caused by psychiatric drugs. The vast majority of all gun crime is caused by our choice to prohibit some drugs. All the cartels, terrorists and gang members only exist because we created a black market with prohibition and all the violence they commit is all a result of the policy of prohibition.
That's how you know the anti liberty people are full of shit, if they really wanted to do something about the rampant gun crime in America they would not push for gun laws, they would push to end prohibition.
But of course it is not about guns, it is about control.