There is a conspiracy plot to suit every suspicious mind.

Hitler fled from Nazi Germany and lived a long and happy life in Bolivia.

The 1960s moon landings were actually filmed in a Texas desert.

Princess Diana was murdered because she was pregnant and wanted to marry the son of Harrods tycoon Mohamed Fayed.

The Twin Towers were bombed not by al-Qaeda suicide killers but by the American military on President George Bush’s orders!

I’d like to think you are hooting with derision along with me at such fantastic notions.

In fact, I said as much in my column for The Sun today.

But the first flush of emails in response to that article, suggests that I have either under-estimated the scepticism and cynicism now rampant in our society - or the gullibility of many of my fellow citizens.

It is absolutely right that we should treat every word uttered by our government with at least some scepticism. Maybe even cynicism.

But there is a limit.

I have been swamped with messages pointing me to websites and internet addresses where I can find conclusive proof that the American armed forces, acting on White House orders, primed the Twin Towers with explosives before the aircraft crashed into them.

How else could both buildings simply collapse in moments, like a pack of cards? (The answer is that the towers’ unique construction system allowed key supports to melt at high temperatures, allowing whole floors to collapse upon the one below)

As for the airliner that piled into the Defence department’s Pentagon HQ in Washington, that was actually a US missile. There are photographs to prove conclusively the damage could not have been caused by an aircraft.

So what happened to the actual airliner that was indisputably hijacked and as far as we know has not landed yet?

How could such elaborate acts of self-harm have been carried out without at least one whistleblower coming forward?

How do such conspiracy theorists conclude that a genuine democracy like America could have gone five years without some senior figure stumbling on what must be abundant evidence that President Bush has perpetrated the most hideous act of mass murder against a nation’s own citizens in the history of the world?

How could any government have coordinated the split-second timing needed to pile two crowded airliners into the most iconic buildings in the world while simultaneously detonating craftily concealed explosives by remote control - in broad daylight as billions watched world wide on live TV???

More incredibly, how can so many people believe such a preposterous load of tosh?

Sadly, too many do.

It is bad enough that such rubbish is being pumped into children and adults in mosques around the Muslim world.

It is appalling that educated young men and women born and bred in Britain believe and spout this claptrap as we saw on the streets of Walthamstow after the arrest of terror suspects last week.

But my emails today suggest such conspiracies are swallowed whole by alarming numbers of non-Muslims with no axe to grind.

And that is pretty scary.