Perhaps soon patrons may demand, locations where people gather, to have at least one armed guard with a rifle.
A trend I’ve noticed (remembering that correlation is not causation) is the at many of these shootings happen in working class and lower middle class areas or adjacent to them, especially if the area recently saw a large influx of young people of a similar background. The societal pressure on those that are barely getting by (both victims and shooters) is only increasing and the resources to help people make ends meet as well as treat mentally ill people is not keeping pace.
There are also psychos from affluent areas travel to working class areas to commit these shootings. An entitlement mindset one way or another. Psychos acting out their insane world views and personal problems out on innocent people just trying to live their lives.