[nlawalker]

The thing is, it's not a bunch of .95s. It's a .00000001 and a bunch of .9999999s. If a person wants to cause terror and is willing to blow themselves up, they're probably already very resolved and willing to do virtually anything else necessary to bypass the security measures you mention and any others.

[WettowelReactor]

Or if all else fails they can blow themselves up at the security checkpoint, or on a train, or on a bus, or metro, or .... Really once a person has decided to blow themselves up their options for committing terrorism are exceedingly large. Luckily this group of people is surprisingly small but or reactions to to the risks are way overboard.