[davesque]

I disagree. This right was a natural guarantee until the internet became ubiquitous about 20 years ago. Human society evolved for a long time under the assumption that people are free to think out loud a bit or even openly express anger on occasion and then change their mind later. Isn't it possible that making that harder to do will lead to even more incorrect and entrenched viewpoints? I don't think it's just about con artists.

Maybe another approach to all this could be that, once you post, you can delete for a while shortly thereafter. But then your post goes into a period of extended residence on a site. Perhaps a year or something. After that residency period has expired, you're free to delete the post.