Disclaimer: I'm not a nutjob. I completely understand the difference between ionizing and non-ionizing radiation. I simply don't believe enough research has gone into terahertz imaging, and don't believe I'll have any recourse against the US government (based on their track record) in the event its proven to have negative health effects in the future.
The idea that the TSA has the "Right" to do what it does, but that expecting the US government to obey the law makes you a "nut job" is what's really nuts.
They aren't releasing the data for when these machines are audited for safety/compliance. https://www.oig.dhs.gov/assets/Mgmt/2015/OIG_15-86_May15.pdf
When our child was born in 2002, there was a lot of 'buzz' about the dangers of vaccinations. Most of it we were quickly able to filter out, but there was a body of research that had strong correlations between lower incidents of a whole variety of early childhood problems in '1st world' countries that didn't vaccinate as early and aggressively as the United States, such as Japan and some part of northern Europe.
We decided to not vaccinate until our son was five years old, an age when he was getting into more crowded social situations. And he has been current ever since.
We weren't 100% convinced that the broad spectrum and very early age vaccinations in the United States were a problem, but we weren't convinced otherwise. At the same time, we knew that vaccinations are an absolutely critical part of modern society.
Like you, we made some conservative BUT WELL REASONED decisions regarding our child.
That kind of middle of the road thinking needs to be way more commonplace.
Sorry for totally hijacking your post. :)