To be exact, for ten years after 9/11 he did his utmost to avoid confrontation with the Americans, conveniently keeping his own skin intact and thereby exhibiting an endearingly human, if somewhat hypocritical, desire to remain alive whilst urging others to get to heaven a.s.a.p. via the bomb-vest method.
Perhaps having four wives (and with power to add), Osama felt that he was already getting his fair share of virgins here on earth. Why the hurry to go upstairs?