This is why I try to tell everyone to maintain situational awareness. Some anti Trump jihadist could have planned something similar, or just taken advantage of the chaos.
We went to the wonderful Capital Airshow a few weeks ago. Plenty of President Trump and MAGA shirts and hats, so we were in good company. That said, I still watched my surroundings. Large group gatherings are tailor made for mayhem.
Honestly, to me it looked like the perfect killing fields.
Lock them in and then create a mass casualty event with the people trapped and no hope of escape.
Could be a mass shooting, a bombing, bio or chemical attack. Even a mass stabbing situation.
If I found myself locked in, I'd be VERY concerned about WHY.