And yet no western politicians seem prepared to accept the obvious.
The chances of disaffected young men being drawn into the evil web of Wahhabist murderous extremism would be significantly decreased if the Saudi funding was blocked.
The Saudis began exporting Wahhabism in the early 1970s when the country’s oil wealth began growing at an ever-increasing rate.
The amount the Saudi royal family, both by government donations and the generosity of individual princes, now lavishes on Wahhabist schools, colleges, mosques, Islamic centres and the missionary work of fundamentalist imams around the world is extraordinary.
In 2003, a United States Senate committee on terrorism heard testimony that in the previous 20 years Saudi Arabia had spent $87 billion on promoting Wahhabism worldwide.
This included financing 210 Islamic centres, 1,500 mosques, 202 colleges and 2,000 madrassas (religious schools).
Various estimates put the amount the Saudi government spends on these missionary institutions as up to $3 billion a year.