Which is really stupid. If I was going to an event and suddenly heard it was so dangerous there that the national guard had been deployed, I would not go to the event. Who would?
Guns, in one word. If you prefer longer answers, it's because police are not the rent-a-cop for private property.
There are definitely social situations where additional security is warranted, that should be clear to most Americans. That security has to come at the expense of those who finance contrived social situations on private property, though.
uh the police literally are the rent-a-cops - this entire thing was about him hiring off-duty cops to stand around, getting paid at cop overtime rates, with their guns, at his conference.
The San Francisco reddit discussion of this included such lines as "Welp, picking up my frog costume from Temu asap.", and "San Francisco must out gay them": https://www.reddit.com/r/sanfrancisco/comments/1o7mexv/trump...