How is it possible to keep airports safe?

Question

After the airports starting prohibiting certain items, I looked up what all items were still allowed. For each of these items, I was able to find detailed instructions making a decent-sized bomb on the internet in under five minutes.

How would it be possible for airports to be safe if even these small, seemingly significant items, can be harmful?

Answer 1

We would therefore do well at some point—and heaven forbid that it take a successful terrorist plot to do so—to consider an alternative model for commercial aviation security that relies not only on high-technology equipment, but also intelligent profiling that screens people as well as whatever they may carry.

A good example of this approach is the passenger screening system used by Israel and its national airline, El Al, since the early 1970s to good effect: the last successful hijacking of an El Al flight was 1968.

Answer 2

its impossible to eliminate every possible danger that some one can think of.