I can't tell you the why, but the how is: crazy people are allowed to own guns.

This guy was arrested prior to this shooting for illegal firearms possession. So no he’s not allowed to own a gun.

That's not true. He was originally charged with a felony that was dismissed. Multiple articles written on it. Here's one that mentions it:

https://www.nbcnews.com/news/us-news/michigan-state-university-gunman-turned-evil-mean-mothers-sudden-death-rcna70579

He plead guilty to a misdemeanor which does not prohibit you from owning guns, and his probation ended in 2021. He was legally allowed to own guns.

Read better.

Some people just want to watch the world burn.

And here's a wild idea; don't give people like that guns

[removed]

Whoops, there went their entire argument

Easy to say, but in practice it’s an extremely difficult and complicated task to decide which individuals are not allowed to buy guns.

While I agree with you we have to remember that this is American exceptionalism at work. Very few other countries have this kind of problems. Australia had this problem and solved it, remember that.

The gun buy back probably reduced spree killings/mass murders, but they’re still happening in Australia

Saying “nobody gets guns” is a lot different than saying “don’t allow certain people to have guns”

I hate to break your bubble but humans have been shitty to one another since the dawn of time and most of the time the motive is at best fuzzy. Mass shootings has basically stoped and the most of them post port Arthur are family tragedies. Before port Arthur you can see, some times multiple a year, shooting sprees but that basically stopped.

Edit: After re reading you answer I saw that i basically parroted your reply. What I'm saying is that people will always do shitty thing even a total gun ban won't change that but it will stop some of the shitty things that happens.

Very few countries say "nobody get guns", what most sane regulations say is , "you'll get a gun if you got a need for it". And look at that ; it works in about all of the western world.