"Trust me, in the end nothing will happen ... "

Why should we trust you? What are your credentials? And by what gift are you able to foretell the future?

"If you are at a concert, a ballgame, in a church, school, theater, post office, and you just happen to be in America, then your chances of being randomly killed are higher than anywhere else on planet Earth."

Cite the source that forms the basis for this assertion, please.

"Given the statistics, as limited as they are, it is unarguable."

Not until you actually provide and source them.

"And, did I forget to mention American exceptionalism?"

You did, and you also neglected to state what it has to do with your premise. As well as neglecting to factor in authoritarian regimes, murderous groups kidnapping young girls, lawless "nations" such as Somalia and Sudan, and ongoing genocide in some areas.