Because it does not make sense to introduce delays to stiffle discussion. Throw-away accounts are used to say things one does not want associated with "main" account; in my case the "main" account is easily doxxable and I knew the things I wanted to say are not going to be popular. I don't care if site mods have access to the logs and can use IP address to add 2 and 2; I just don't want that post above to be associated with my real name forever, via simple google search. I'll have to look for a new job soon, if layoffs continue at the present pace.

I would be happy to have this discussion face to face without having to hide behind an anonymous account but the rules for in-person debates do not apply on the Internet forums.

In rare cases, it allows useful contributions or participation involving someone who has never used Hacker News before, but summoned to participate because the discussion involves them.

There should be a flag that hides new users by default... but consider carefully if you really want to be that person that makes use of such a feature lol

I'd add that it's essential for throwaways, which are sometimes necessary for open discourse depending on the account and topic. Many highly active HN accounts are semi-professional, linking to off-site profiles.

The green seems to make for a good cautionary flag though.