Unemployment and radicalism are the key. When you has nothing to do day by day and those lying muslim radical preachers every day whisper you that western civilization is your main enemy, ==
IMO umemployment is not a key. Use this argument is like if thief explains his thivery by his poorness. "I'm poor and I want better life that it why I steal". This argument won't play in court.
Religious radicalism infests poor same way as rich. AFAIK Bin Laden is from family of multimillioneers and well-educated. So it is choice of anyone where to direct your energy and power despite of his wealth and education.