OK. We'll see. I think there's lots of confounds-- e.g. vastly differing vaccination rates among children vs. the population at large.

In any case, we have actual case control studies showing mRNA vaccine efficacy against illness and particularly against severe illness from Omicron. They disagree on the amounts, and in some cases the numbers are not thrilling (30%), but there's no studies so far implying no efficacy.

The study we're discussing here concludes its abstract with: "These data support the notion that, provided high neutralization capacity is elicited by vaccination/boosting approaches, reasonable effectiveness against Omicron may be maintained."

That's just plainly not true, as a matter of government policy. There's a soft mandate in some settings like hospitals. Otherwise it's up to the employer, and there are tons of employers without policies.