Ok, now consider this
"Most of the research shows that people with mental illness are actually less likely than the general population to go on to shoot somebody else or to commit mass violence," said Dr. Jonathan Metzl, a psychiatrist and director of the Center for Medicine, Health, and Society at Vanderbilt University in Tennessee. "To be honest, it's quite frustrating as a psychiatrist to have this kind of false narrative be perpetuated because it's a distraction from the story we should be telling."
https://www.pbs.org/newshour/science/why-mental-illness-cant-predict-mass-shootings
Thats an intresting read. Dint knew Trump propose that same thing, but what the psychaitrist said made sense. My idea was based on personal expirience. Anyway, if that kind of screening wouldn't work because distress is unpredictable, at least a through background investigation with some kind of waiting period to do it correctly would be better than taking home the weapon the very same day. Someone who has a clean record would have nothing to worry about anyway.
Voting is not the same as buying a weapon. Like i said, the pursuit of freedom and happiness is also a constitutional right, yet if you screw up, you loose both freedom and voting rights. The same should go for weapons, its a right you should loose if you screw up with society and proven guilty, specially for something like homicide or rape IMO. A background check would not prevent 100% mass shooting, but its a way to making weapons less accessible than they are now in most states. Something gotta be done about this. I remember reading a while back some Vets were guarding high school armed with AR15's i thought that was a great idea too when i read it.