“The restaurant staff or manager should have stepped in, defended their paying guest and kicked the 2 legged rubbishy group out the door.”
If twenty people suddenly walk in to any store in the country without warning, ignoring requests to leave, it will realistically take more than three minutes to get police to arrive. They can not reasonably be expected to be the first to resort to physical force, especially when they are outnumbered by a mob.
They should just all eat at Trump’s restaurant at his hotel