As to this query :
“I don’t know why everybody is running to buy these expensive and useless machines. I can overcome the body scanners with enough explosives to bring down a Boeing 747,” (Israeli Airport Security expert) Rafi Sela told parliamentarians probing the state of aviation safety in Canada."(1)
It answers itself. Plush contacts from the public till to enrich connected friends in the security-military sector.
What could be better ?
1'Full-body scanners are waste of money, Israeli expert says' - Vancouver Sun
2'We Won't Fly' - Website