Alea,
I understand\agree with nearly all you state, tougher clearance\permit laws, better mental health services, banning assault weapons, harsher penalties (very harsh penalties - including the death penalty in some extreme cases) however I would simply add the inclusion of very select concealed weapon permits, even if that means paying thousands of dollars for an FBI background check akin to attaining security clearances. Also, as you cite, training and coordination with authorities is a must to avoid situations of mistaken identification.
Can't speak for you but feel better there are some covert armed air marsalls on some flights. I do not feel more threatened knowing someone ( a "good" person) on my flight has a firearm.
Cities are broke and cutting back on police personnel. I am not advocating armed vigilantes. I suggest very strict "scenarios" where good guys may intervene and very very harsh penalties when breached regardless of outcome.
I went to the mall with my family yesterday. I am outraged and embarrassed that I had to give a "contigency planning outbrief" before we entered. There are many thngs we need to do to make this country safe again. I'm rather willing to try them all. Meantime, the popcorn scenario is real. And I know at this point, I am not willing to die with maze instead of a weapon in my hand trying to protect my family. Much rather have a higher comfort factor than carry a weapon. However, I nor this country can afford to wait 40 years to turn this around. We need to force this issue on the Hill. NRA and bad guys be damned.