It is the new Chewbacca defence [1], whenever the discussion deviates from the desired narrative it is enough to bring on a variation on 'but Trump did XXX' or 'at least it was not as bad as Trump' or 'just like Trump' to derail it.

Now that the precedent has been set this is likely to continue with one side using the mentioned but Trump arguments which are countered with at least he was not as bad as Biden. Rinse, repeat, ad infinitum et delirium.

[1] https://rationalwiki.org/wiki/Chewbacca_Defense