> 3) at least one of the mink variants of covid-19 is different enough that there is reason to worry the vaccines might not give immunity to it,

This is patently false, and the press have kept on saying it wrong to keep the terror giving them clicks. That mutation:

- Hasn't been observed in humans since Sep 5th;

- gives a slight advantage over escaping neutralizing antibodies (10%, not 100%)

- has no "fitness" at this point because there is no selective pressure for it

- has no effect on T cell based immunity

The Danish move was out of precaution, not because of the mutation, but because minks can become huge animal reservoirs of the virus due to the ease it spreads among them.