In a country of 323,000,000 people, how do you control everyone, all the time? Answer: you don't. But somebody dropped the ball by not seeing this dude carrying all this gear into this hotel, and allowing him to set up all this without noticing SOMETHING.

And another thing: the sponsors and promoters of these outdoor events need to be acutely aware of the setting and whether it allows a high vantage point as this shooter had. No way for this to have happened without the position the shooter possessed.

No excuse for this to ever happen again in such a target-rich environment.
JR


Be strong, be of good courage.
God bless America, long live the Republic.