https://www.deseretnews.com/article/900011165/parents-of-slain-girl-say-a-strong-family-may-have-prevented-nikolas-cruzs-shooting-spree.html

Strong families is the more effective solution.  More effective than limiting gun rights.  More effective than banning violent video games.  If parents don't care that their kids are spending 4 hours per day being virtually violent, then I don't know what to say.