Considering the history of the civil rights movement in the US, we're not going to get saner laws without a little civil disobedience. It sucks to bear the brunt of this harassment, but saying "yes" only enables the system to harass everyone more efficiently.
But now I don't even opt out.
Instead I tell them that I can't raise my arms above my head. They direct me around the scanner (sometimes the metal detector too), swab my hands, and call it done. I often skip 10-15 people in the process. If they ask why, I tell them I have a medical condition and they're not allowed to ask further so I don't explain.
Hopefully the bad guys never figure it out!