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Radiation is cumulative. Saying that you will absorb more radiation in flight is not a justification for accepting radiation from another source. You will still absorb more total radiation. It's a lot easier to avoid the scanner, than it is to find an alternate mode of transportation across long distances.

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In one situation, large quantities of X cause no visible concern to people. In another situation, much smaller quantities of X cause serious outcry, even when no harmful effects from those smaller quantities have been demonstrated over twenty years of study.

I suppose it's possible for someone to be genuinely concerned over these very small quantities of radiation. But it strikes me that for the average person what underlies the panic is

1. a counter-factual belief that more health-harm is done by a new technology than actually is,

2. a diversionary appeal to concern for safety when health risks are not really a significant negative of a new technology.

This happens in all kinds of areas. Artificial sweeteners, GMO foods, irradiated meat products, and vaccines have all fought or are fighting this battle. The only reason this type of thinking is given a pass here or anywhere reasonable people congregate is because the community is so opposed to the technology for other reasons.

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