No one is purporting to decide what's suitable for you personally. It's a question of what belongs on the HN front page. If the speculation were coming from a known source, this might be a harder call. But an anonymous pastebin that no one has any evidence for? That falls below any standard. So what you're really saying is that HN should have no editors at all, and that's not how HN has ever worked.
This was a good call. eBay has just officially denied that the user data is theirs [1], and there are claims online that the data was from a separate previous breach [2]. This is almost definitely a scam.
[1] http://www.digitalnewsasia.com/security/ebay-hackers-offer-d...
[2] http://www.reddit.com/r/netsec/comments/267015/ebay_user_dat...
Let's face it. Lots of posts on HN are pure speculation but they don't get buried. In this case, leaving it up won't do any harm? If it's not real, then no problem. You may have convinced a few people that they should change their passwords though, but that is a good thing. If it is real, then people will already have changed their passwords. It is win win.
Personally, I'm getting really sick of the mods deciding what news is and isn't relevant and/or suitable for me.