Like it is on nearly every platform that has an comment function, users should be able to delete their own comments without having edit rights on the content/page they commented on. The posibility to delete their own comment should come directly with the comment-right itself.

Currently users can only delete/remove their own comment, if they have edit rights on the page they commented on.

If users only have view and comment-rights on a page, they can post a comment and edit the comment, but they can however not delete/remove their own comment.

Forum post:

https://forum.xwiki.org/t/delete-own-comment-when-only-having-view-and-comment-rights/13650