This is trial and error. They opened their casinos and restaurants with measures that would prevent the spread of the virus and they failed the first time. They corrected their errors and opened those businesses again. The second time around, they still had failures and then they learned lessons and designed certain additional measures.
Well that's how most of the theories work, by trial and error the risk is always high at first, mild at second and supposed to be low at the third time. I'm pretty sure we can reopen now with effective guidelines measure, appropriate attires, proper hygiene and self-awareness. Lesson from the past attempts surely sinks in.
And now this is their third attempt. I wish for them the best. This is obviously a hard time to balance the attempt for economic recovery with keeping the virus at bay.
but I forgot this is America, land of self proclaim people. Saying that the virus is not real, "my body, my choice" lol I'm not telling all the americans, I haven't been there, but what I see on videos and articles describe what it's like in there.