Binary liquid explosives are a sexy staple of Hollywood thrillers. It would be tedious to enumerate the movie terrorists who've employed relatively harmless liquids that, when mixed, immediately rain destruction upon an innocent populace, like the seven angels of God's wrath pouring out their bowls full of pestilence and pain.

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We're told that the suspects were planning to use TATP, or triacetone triperoxide, a high explosive that supposedly can be made from common household chemicals unlikely to be caught by airport screeners. A little hair dye, drain cleaner, and paint thinner - all easily concealed in drinks bottles - and the forces of evil have effectively smuggled a deadly bomb onboard your plane.

Or at least that's what we're hearing, and loudly, through the mainstream media and its legions of so-called "terrorism experts." But what do these experts know about chemistry? Less than they know about lobbying for Homeland Security pork, which is what most of them do for a living. But they've seen the same movies that you and I have seen, and so the myth of binary liquid explosives dies hard.

Better killing through chemistry Making a quantity of TATP sufficient to bring down an airplane is not quite as simple as ducking into the toilet and mixing two harmless liquids together.

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It's been claimed that the 7/7 bombers used it, but this has not been positively confirmed. Some sources claim that they used C-4, and others that they used RDX. Nevertheless, the belief that they used TATP has stuck with the media, although going about in a crowded city at rush hour with an unstable homebrew explosive in a backpack is not the brightest of all possible moves. It's surprising that none of the attackers enjoyed an unscheduled launch into Paradise.

So, assuming that the homebrew variety of TATP is highly sensitive and unstable - or at least that our inept jihadists would believe that - to avoid getting blown up in the taxi on the way to the airport, one might, if one were educated in terror tactics primarily by hollywood movies, prefer simply to dump the precursors into an airplane toilet bowl and let the mother of Satan work her magic. Indeed, the mixture will heat rapidly as TATP begins to form, and it will soon explode. But this won't happen with much force, because little TATP will have formed by the time the explosion occurs.

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It should be small comfort that the security establishments of the UK and the USA - and the "terrorism experts" who inform them and wheedle billions of dollars out of them for bomb puffers and face recognition gizmos and remote gait analyzers and similar hi-tech phrenology gear - have bought the Hollywood binary liquid explosive myth, and have even acted upon it.

We've given extraordinary credit to a collection of jihadist wannabes with an exceptionally poor grasp of the mechanics of attacking a plane, whose only hope of success would have been a pure accident. They would have had to succeed in spite of their own ignorance and incompetence, and in spite of being under police surveillance for a year.

But the Hollywood myth of binary liquid explosives now moves governments and drives public policy. We have reacted to a movie plot. Liquids are now banned in aircraft cabins (while crystalline white powders would be banned instead, if anyone in charge were serious about security). Nearly everything must now go into the hold, where adequate amounts of explosives can easily be detonated from the cabin with cell phones, which are generally not banned.

Action heroes The al-Qaeda franchise will pour forth its bowl of pestilence and death. We know this because we've watched it countless times on TV and in the movies, just as our officials have done. Based on their behavior, it's reasonable to suspect that everything John Reid and Michael Chertoff know about counterterrorism, they learned watching the likes of Bruce Willis, Jean-Claude Van Damme, Vin Diesel, and The Rock (whose palpable homoerotic appeal it would be discourteous to emphasize).

It's a pity that our security rests in the hands of government officials who understand as little about terrorism as the Florida clowns who needed their informant to suggest attack scenarios, as the 21/7 London bombers who injured no one, as lunatic "shoe bomber" Richard Reid, as the Forest Gate nerve gas attackers who had no nerve gas, as the British nitwits who tried to acquire "red mercury," and as the recent binary liquid bomb attackers who had no binary liquid bombs.

For some real terror, picture twenty guys who understand op-sec, who are patient, realistic, clever, and willing to die, and who know what can be accomplished with a modest stash of dimethylmercury.

You won't hear about those fellows until it's too late. Our official protectors and deciders trumpet the fools they catch because they haven't got a handle on the people we should really be afraid of. They make policy based on foibles and follies, and Hollywood plots.

Meanwhile, the real thing draws ever closer.