Back to the wall booth on the side. Sometimes their busy and have no booths open in which case I at least sit facing the entrance. Situational awareness is everything in public and very easy to make a constant habit without being obsessive. I believe these types of tragedies will only increase in the future with as nutty as people are lately, so it's only good sense to pay attention when in public.
Ditto on that. But me must still go out and live our lives regardless and not let them bring us down.