The only way to improve Hacker News is to submit more and upvote interesting stuff. If the TSA material is interesting enough to people on here to make the front page, then submit something more interesting and people will upvote it.
FWIW I don't mind technical stories about the scanners, but the political side of things doesn't directly affect me, nor a significant number of the 5.7 billion other people who are not in the United States. That's why I've been trying to post every day here in the hope that it will give others better things to read.