The main component of this issue is the mental health area. Something they will never do anything about.
In virtually every case, the shooter displayed behavior that should have brought intervention in one form or another. Multiple agencies failed to do their jobs repeatedly. Schools, police, municipalities, medical services.
The left just wants this issue as a vehicle for further gun control. They have no interest in anything else regarding it.
Prescription psychoactive drugs and raised without fathers pretty much covers the field.