1) Usually users own the copyright of their comments. They do have the moral right at-least to disallow continued propagation of comments. 2) It should still b

1) Usually users own the copyright of their comments. They do have the moral right at-least to disallow continued propagation of comments. 2) It should still be possible to delete accounts, without removing comments -- but reassigning those comments to a temporary/anonymous account id. This solves for account deletion, but not content deletion.