It has been learned that five of the participants in a banquet held in Ginza, Tokyo last month by 23 employees of the Ministry of Health, Labor and Welfare have been newly infected with the new coronavirus. This brings the total number of infected banquet participants to 12."(From the news article)

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The content of this article alone does not provide "physical evidence" to identify the banquet as the direct cause of the infection -- well, it's "circumstantial evidence" enough.

"The main cause of new coronavirus infections is "banquet""

That's enough to "confirm" it.

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The fact that the subject was an "employee of the Ministry of Health, Labor and Welfare" gave it a whole new level of credibility.

To order restaurants to cease operations is to restrict "private rights", which are the foundation of democracy.

The utmost care should be taken in its operation.

However, it is rare to see such a convincing "endorsement" of "restrictions on private rights".