The cop doing the talking on the evening news was trying to make it the restaurant owners fault - (paraphrasing) "We asked them to not let the event happen and they didn't listen to us, now look what happened".
I'm siding with the owners at this time. There are many reasons they might have wanted to have the event, some of them good, some not. Either way, it ain't the cops place to tell the owners what kind of event they can have or not. Cops knew about it in advance, had officers there waiting, just in case. That's OK by me. But to try to stop it just because there might be trouble, nope.