Actually, it's called being a Republican hypocrite. Not much more than that
That would satisfy the "conventional wisdom" idea of Ockham's Razor, wouldn't it? "The simplest answer is usually right."
Except that the "conventional wisdom" version of Ockham's Razor is inaccurate. Ockham's Razor really goes like this:
"The explanation with the fewest number of unnecessary variables is usually correct."
In the moment the photo was taken, those people were being whipped into an hysteria while having almost no verifiable data themselves. They were told that the place was under siege by an army of wild-eyed, bloodthirsty killers. That's the point of time the photo came from.
Later, after the panic had passed and genuine information came to light, the gent made his statement about tourists.
Now, here's the litmus test for our descriptions of the man's reaction:
Whatever you may think of the January 6th protest at the US Capitol, this video really destroys the "insurrection" narrative.
kprcradio.iheart.com
Police allowing people into the capitol.
If it'd been a violent, armed siege, they wouldn't have done that. And yet... they did.
Now, that's not to say that the hysteria itself didn't result in needless violence -- an unarmed female Trump supporter was shot and killed, and I'm sure the police officer who pulled the trigger feared for his life. God knows she might have had chapstick in her purse, or something, he couldn't risk that.