You know, like the last would be bomber.
Can we put to rest the myth that it's lack of opportunity and education that creates terrorists? It's blatantly not true.
It's exactly that which blinds people to see that there are plenty of other reasons outside of material possessions and education that drives them to become radicalized, that is the root cause of all this.
Dissatisfaction has many roots, not just those that one kind of society values.
A significant part of terrorism is based on an imbalance of power, where one group exploits another or merely when one group feels significantly slighted or oppressed by another group.
That is why, I believe, that these educated people become radicals after their western education. They see a huge power imbalance that marginalizes them and their culture. They see a culture and history that conspires against their way of life, where the entrenched powers exploit every possible avenue to stay on top, some times at the cost of other players
Theses terrorists strike out not because they lack for food, medical care or freedom, but because they identify with a group that has been oppressed or subjected to the whims of another power to which they don't identify or resent. It is especially effective if that other power conceptually conspires against their preferred way of life.
In other words, your measures would merely raise the standard of living, but would not eradicate the power differences that give rise to the fundamental fuel of terrorism. I would agree that it would reduce the incidence of terrorism overall, as it would become harder to find martyrs, but it would not eradicate the phenomena.
That approach doesn't scale. Imaging the organisation needed for sending 1000 suicide bombers. Now imagine keeping it functioning, and avoiding consequences catching up with it as it sends in the first ten or so.
So you probably don't need thousands, you probably need on the order of several 10's or so to get through once.
Keep in mind that there is a reservoir of 1000's if not 10's of thousands of people that would gladly give their lives to do damage to others.
They didn't pick a guy from Africa for nothing and a guy from England last time, those are much easier to escape profiling (the first time). I wouldn't be surprised if the next one would be asian, assuming they have such a person in their ranks.
No filter that has to pass the number of passengers that we're looking at here will ever be perfect, and if you study the filter long enough you're going to find holes.
And suppose the filter is perfect, then move on to other, softer targets until through lack of activity the filter loses its effectiveness.
Basically any place where lots of people gather (lots is something larger than 50 or so) is a target for a potential attack.
And the underbomber's gang will get, supposing that they can try repeatedly - what? - Three goes tops before the hammer comes down on them.
Airport security is after the fact, you need to work to create a world in which would-be-suicide bombers have too much to lose, and are too smart to be brain washed.
In the end that's probably cheaper too.