"I wish I had my gun with me..."
This is why you not only carry everyday but also previously made the conscious decision to use deadly force if grave danger is used against you or yours.
Hope is a failed strategy. Wishing is confirmation of such strategy.
Don't wish. Do.
The takeaway of today's events: Avoid controversial events. Violence will happen anywhere. No one's coming to save you. You are on your own, act accordingly.
Two center of mass, continue until he is down.