The point isn't that it's uninteresting to you, the point is that it may very well be interesting to stalkers, bosses, insurance companies, thieves, exes, "lost" relatives, arsonists, mother stabbers, father rapers, litterbugs, jaywalkers, identity thieves, nosy neighbors, and other undesirables.
It's a thought experiment. Along the lines of
YOU DOLTS, YOU REALLY SHOULDN'T BE PUTTING ALL THIS STUFF OUT HERE!
On a purely ideal level I agree with you (the fact that at any time someone has been fired from their job for expressing personal opinions on non-company time does not sit well with me..), but the reality of it is, how many of these people do you think know that their info is on this site and/or accessible to quite literally anyone in the world? Of the people that know that, how many of them do you think understand the implications of that openness?
I've got a fantastic idea: Why don't you make a list of all the pages on the internet that don't interest you, and then tell HN about it. Then I can use that as the starting point for my list.