Yep, as mentioned above, often "chaffing" is a more realistic approach. Sowing confusion is easier than refuting or censoring.

Often you can't take back what you said, BUT you can change e.g a non archived profile image to associate comments with a fake account.

Related question: is it best to give a child a unique, or very generic name?

Currently I lean towards generic, as unique names or pseudonyms can be created on demand.

All of this intersects in interesting ways with "real name" policies IMHO