Suicide bombers need bombs. I don't think anyone's objecting to searching passengers and luggage for bombs.Okay, let's say we dispense with all pre-flight searches. How do you fight a suicide bomber with a handgun or other weapon?
Searching for bombs, however, is not easy. Bombs don't require much or any metal, so a terrorist might even be able to wear one going through a metal detector. There are different types of high explosives, and a detector has to look for all of them to be effective.
Given the miserable success rate airport screeners have of catching guns and knives, I think that they would fail to catch a cleverly-built bomb most of the time. What they're primarily trained to look for are prebuilt bombs. Put some semtex in candy bar wrappers, carry on a multimeter with blasting caps disguised as leads... rig a bluetooth remote detonator using a cellphone and a wireless earpiece...