They don't show anything internal, so body cavity bombs wouldn't show up even after the cancer-causing scan anyway. Have you even looked at the studies? Why do you want the illusion of safety at all? I'd much rather feel unsafe and be alive than feel safe and die, personally. Of course, I've watched knives be accidentally carried on planes multiple times, so I am certain security is nothing but theater.
We're lucky that there are only a few terrorists in the world and most of them, like most everyone, aren't particularly good at what they do. After all, if they were smart they'd have launched a front corporation to funnel money through to Republican-supporting PACs and try to get Congress to refuse to raise the debt ceiling again next time it comes up. A default would cause far more American infidel pain and suffering than another terrorist attack.