The laws in place are the reason why they are let loose. I fully believe that some people need long term hospitalization to function their best.
Just read your comments (after watching a profiler/Psych PhD/Lawyer being interviewed by Megan Kelly). Profiler was very good and pointed out the 18-20 age when psychoses begin to show in isolated schizophrenics etc.,
His mother and his teachers apparently never sought help for his increasingly threatening behavior - which could have possibly prevented his ‘snapping’ and murderous rampage. At least he would have been monitored and unable to purchase that Glock 9mm.