People have to make the choices that are best for them....and for a lot of travelers, it is much more complex than just opting out or walking through a scanner.

I typically opt out of both types of scanners (though I *never* use the term "opt out.") But I have, twice, I think, made a decision (for reasons of my own) to go through a MMW scanner. I expect my decision to be respected -- whatever it is -- and so it's pretty compelling for me to respect the decisions other people make.