You should try to eliminate the source of the threat, and the source is anger, hatred, injustice, intolerance, poverty and all kinds of complicated things still present in our world. By all means exterminate bin Laden and his organization, and do it without harming innocent people (right...), but see it for what it is, and see yourselves for what you are, and not as the heroes, the good guys. And unless you are able to solve all these other problems there is a good chance that the problem of "terrorists" will remain.