It is on us to make moral choices. You are suggesting we do so by making email repudiatable in order to protect a hypothetical person from being outed via stolen email verified with dkim.

So far as I can tell this has never happened in history and logically neither blackmail nor public harm via exposure of sexual orientation particularly requires dkim verification.

It looks like you are asking us to give up DKIM verification which could and has aided us to verify politicians leaked emails in search of a purely hypothetical gain that may never materialize by suggesting that we both must and must not make moral determinations.