The liberty to be anonymous online is worth protecting, not because anonymity is an absolute good, but because the alternatives proposed by the state are far worse.
Now that leftists are facing the consequences of free speech, they can’t identify the inconsistency. I suspect that is more likely the result of political inconvenience than genuine confusion.
The alternative is ongoing decline or an adoption of colourblind authoritarianism which would see us acquiesce to ongoing reductions in freedom in the name of public safety whilst gaining nothing for it.