Do you think killing Bin Laden was best course of action?

What was Bin Laden's main role in Al-Qeada? To fund and organize the operations, and to teach. Now that he is dead, do you really think anything will change? Do you think he kept all of his money and ideas to himself? Al-Qeada was his life, and now the organization has another martyr. Why do most people think that things will change for the better?