My view (from "the continent") is that 99% of the Muslims in my neighbourhood is mostly interested in raising a family, having both ends meet and living a life. The proportion of extremists among Muslims is about as big as the proportion of football hooligans among the general population. I am sure that one can increase the amount of disgruntlement in any group by consistently discriminating against them; government oppression is a great way to induce violence.
When you look at the active terrorism: most is directed at "Western" military presence in the Middle East. The Taliban sees US and British troops in Afghanistan as foreign occupation. (There would be far less Muslim terrorism if Bush and Blair had not sent troops in.)
The way to prevent people slipping into terrorism is integrating them in society. Open a dialogue with the moderates and show them respect. I won't object to sending out some extremist preachers; but please keep the moderates! Stay in touch with them and give Islam a place in your society.