While I wholeheartedly agree with the first part of your post, I would disagree with the second part of your post wherein you say that it is necessary to do whatever it takes to propagate the cause of Islam. This is the exact reason why the community is not progressing. Different people have different opinion about what is actually needed to propagate the casue of Islam.
Osama truly believes that he is propagating the true cause of Islam. It is essential that people reform themselves and keep the reform to themselves not instigate others to follow the path.