I came back to the thread to talk about Monday's shooting only to find out I've been missing some truly amazing doozies like when CLOUD500 said being searched for weapons before entering a Detroit club is a tactic from Communist so and so place.
As apocryphal as your suggestion is, Cloud, being searched for guns is exactly what you get for living in a country where the solution to every gun tragedy and conflict resolution for most people is the same thing: guns. I was dragged to a megachurch by a friend that was in town in June. The first thing we did before entering service area was pass through metal detectors. I also went to a concert last month. Before I entered the venue, I first had to empty my pockets and pass through a metal detector. Searching people for weapons before entering large public spaces isn't some braindead attempt to "take the guns away." It's exactly the same security measure you encounter at the airport. Several courthouses have metal detectors before entering.
We live in a society where we can be shot at anytime, so making people pass through metal detectors in unassuming places like church and concert venues is a security measure to keep respective churchgoers and concert attendees safe. That's the same reason why you get searched for guns in Detroit or even some strip clubs around here.
Now, regarding Monday's shooting what are the people that routinely blame mental illness saying about the ease of getting a gun in the US? The idiot that took 7 lives and turned one toddler into an orphan attempted suicide in 2019. He later threatened to kill every family member later that year. Despite his suicide attempt being treated as a mental health emergency and police being called to both events, neither incident barred him on any database from buying five guns.
Other countries also have mentally ill people. But if you're mentally ill and want to shoot people, there's no industrialized country that makes it easier to do than the US.