[yew]

Sending death threats or racial invectives by private message is as much speech as sending them by Twitter post.

All private conversations shouldn't be published. That isn't necessary to hold people accountable for dangerous or violent speech.

Publication and repudiation aren't the same thing.

[cortesoft]

There is no way to allow the verification of a death threat message without also allowing the verification of political dissidents, for example.

Yes, it might make it harder to punish death threats, but privacy is too important to sacrifice.