You needn't use your real name, of course, but for HN to be a community, users need some identity for other users to relate to. Otherwise we may as well have no usernames and no community, and that would be a different kind of forum. https://hn.algolia.com/?sort=byDate&dateRange=all&type=comme...
That applies 10x when said accounts are breaking the rules, as you've unfortunately been doing. If you want to pick one account and want to commit to following the rules, you're welcome to email hn@ycombinator.com and let us know which username you want to use.