Reparations and all....
There are security concerns beyond that as well.
You have advance word of a large and confrontation-minded protest in an enclosed space with lots and lots of people If you’re an Islamist terrorist cell, thats one hell of a target to go after.
You don’t even have to take a lot of ammo and pipe bombs in with you. Just enough to get things rolling into a snowball effect. More people will die and die faster from trampling then you could ever dream of using more direct methods.
*shudder*. Nightmare scenario. You couldn’t pay me enough to go anywhere near that place.
“Black Lives Matter” aka: “The Free Sh!t Brigade”