The biggest nonsense is to turn any discussion about this sort of tragedy into a general "pro gun" or "anti gun" argument (with the very foreseeable outcome of everyone being reinforced in their limited view of the world).
I have lived in a country, where every lengthy knife or xbow poses a problem (Germany), every legal firearm is required to be kept in a security safe/box, and most sheeplings willingly accept that nobody except police, military and criminals is supposed to have guns. And I still knew enough people there who had access to guns - legally or otherwise.
I have worked in a country (Switzerland) where almost everyone has access to military-grade weapons in their homes - and nothing much ever happens.
I currently live in a country (Paraguay) where the law allows basically everyone to own a gun, and where a lot of people even carry guns outside their property or have them in their cars, because the police usually looks away - and while ofc the occasional shooting happens, there is not much to worry about and I have never heard about a teenager running amok with a gun here - (while they would have plenty of reason).
Putting reasonable gun ownership restrictions in place is one thing and should be discussed with a cool head - not linked to some tragedy that is exploited for the obvious agenda to disarm the people.
Thinking about the real reasons behind that level of hate in a young person, the disrespect for their own and other lives, the frustration, the lack of perspective etc.etc. might be less convenient than shouting "ban the gunz" (because it might involve questioning our current lifestyle/society/values/education/economy/...), but it might actually lead to something.
Just removing guns from the game won't help shit.
P.S.: oh, and I'm a Iota Male. The type you don't find in the psych books. Stands for independant. Fuck the wrongly interpreted wolf analogies.