Prescription drugs from opiates through benzodiazepines to antidepressants would play a large roll in the problem 'murica has with shootings etc, among MANY social issues the country faces.
America's gun laws are f**ked, but changing them at this point probably won't have the same effect it did for Australia. They're too rampantly accessible, and the sheer number of unregistered/illicit firearms in the country already probably screws the same approach Australia had with the gun buy-back scheme etc. Not to mention how stubbornly they stand by their second amendment, which they aren't even taking seriously (let's face it, I'm sure they'd have enacted its purpose by now if they did).
Guns are just the most accessible release for the issues far too many citizens there have. It's much more than the guns - and I agree they should be f**ked off big time like they did here - it's the state of society and mental health playing an overwhelmingly large role in these events (imo) and if not for grabbing assault rifles and opening up on a cinema, it would be something else.
I've not got a tinfoil hat prepared for Big Pharma, lol. There's much money being made there, and there are quite clearly people in this world evil enough to manipulate shit so the status quo remains and they continue to profit from it beyond any needs they or their company may ever have. Not to say 'Big Pharma' is what some suggest, but goddamn to stand on a soapbox and laugh like such theories are as insane as alien abductions is laughable in itself.