I think there are many reasons why it has been prohibited, and like any other movement- it involves education of the masses to remove the stigma, and strong people willing to risk incarceration to right the wrong. We have successsfully fought other injustices, so why do we resign ourselves?

One reason is that many of us are able to partake enough that the risk isn't worth breaking our annonymity to further the cause. I think fear of exposure is what keeps people who have a lot to lose (kids, careers, etc) from getting involved. I personally try to keep a fairly low profile, though I am concerned that by receiving alerts from the Marijuana Policy Project, and varies other listservs, I am exposing myself.
So I think it is imperative for the youth of the world to be courageous enough to take a stand and join organizations that are already working hard to change the laws. As a teacher, I strive to instill in my students the critical thinking skills they will need in order to avoid just being sucked into the status quo.

I'm the first to admit that I don't want to be a martyr to the marijuana cause- I don't want to lose the chance to adopt children, or lose my job as am educator. I use marijuana instead of Prozac, and as long as I can either obtain it or grow it, should I risk it all? So far the answer has been no, so I guess I am part the problem?
To be forced into that choice is what stops the revolution, I think.