Because someone submitted it, it showed up in new or the home page, it didn't need prior approval because there is no editorial board, at least 69 people upvoted it, and it hasn't been removed yet by a moderator if it does break any submission rules.

Because that's how news aggregators like HN and Reddit work.

It’s about adjusting your habits and personality with intention and workarounds for your normal mode. What’s not hackerish about that?