If everyone opted out, the program would be scrapped. You can tell me about how the scanners give harmless amounts of radiation, but I don't really care. You have to stand for your principles. In this situation, a government contractor forced more security theater upon a country, with the only benefit of the entire charade going to their bottom line. Nobody is safer, an entire mode of transport has a new bottleneck, a government agency has expanded and is emboldened and now wants even broader jurisdiction, and as the article states, people are driving more and dying.
If we don't stand up and push back now, things will only get worse. More invasive, more annoying, more useless, more dangerous. And not an inch gained against the stated purpose of deterring terrorist attacks.