I’m sorry, there’s no other word for it.
If the Veep lets his security detail de facto veto speaking before disable vets in Vegas, he probably is not fit to speak to disable vets in Vegas.
You secure the venue the best you can — security can always be “better” — move out and take the risk. Those in the audience surely did.
Bonus Observation: Wonder if security concerns would be the same if the event were in, say, Biloxi rather than Vegas.
