I'm with you on that. I flag articles that are political. That said, the posts about the science behind backscatter radiation, and subsequent discussion on HN, I've enjoyed.
I think he's just upset about the TSA articles. That point keeps coming up over and over again in his post. It weakens what he has to say.
It's clear he supports the TSA to "stop planes from getting blown up." Since the majority of HN doesn't agree with that sentiment (at least that's how he paints it), he's sort of being a baby about it and quitting because he can't handle disagreement. He masks this fact very thinly in a what is definitely a stereotypical flameout post.
Communities disagree, and they're not all perfect. Nothing new there. If there was no disagreement on HN, it'd be boring.