We sell the Saudi government arms to repress their people. Some of the Saudi people return the favour by exporting terrorist ideology to the streets of Britain.
It's a somewhat depressing history. The US and UK has a history of supporting governments in other countries that are right-wing dictatorships. After a while the ordinary people in those countries get fed up with the repression, corruption, murder, brutality and inequality of their daily lives and start supporting an armed struggle or rebellion against their leaders. At this point the Communist countries start supplying arms to the anti-government rebels. And then you end up with a revolution - either Communist or religious - like in Iran and a different repressive government that nationalises things. Then the US/ UK start supplying weapons to the anti-government rebels....and so on and so forth until the country usually ends up with a prolonged civil war, poverty, death and destruction.
It seems that Bin Laden tried the same tactic as the US/ UK of starting civil unrest on the streets of USA and Britain to destabilise social order and the government. Instead of supplying arms to organised civilian rebels in Britain and the US, he supplied terrorist ideology and encouraged lone wolf attacks.
Meanwhile a group of people are making money selling drone technology to various governments to take out terrorists.
