It's possibly more disruptive to give them bad service. Put way too much pepper in their lunch, get them lost with incorrect directions. If you refuse immediately, they might find help from another source quickly.

That's disrespectful.

Restaurants should offer free food to those heroes for a few days for protecting Americans from foreign criminals.

Then they can release all the pictures they took of them when they removed their masks to eat.

Yes, but ICE should not be able to count on cowardly business owners without their employees being plausibly incompetent.