Well I mean it's my personal blog, there's really no need for https since there's no user accounts or login. Are you saying HN is insecure because they don't use https? How about Reddit, no https there either.
There is a HTTPS wrapper around HN, but it has been pretty flakey lately (lots of timeouts): https://quickhn.appspot.com/news
I do agree that if you don't have user logins there is no real threat. The only possible 'attack' then would be an ISP injecting ads or injecting other content that you didn't write :)