to take a freedom from everyone based on a worst case scenario is illogical. sure there are those who will spend they're entire lives stoned and steal to maintain the high, but the majority will be capable of moderation. by an across the board prohibition you are essentially penalizing everyone for the failings of the few. if this seems right to you, then perhaps you're ready to live under a totalitarian regime. i, however, am not. the very idea of someone else deciding how i should live my life is repugnant, as it should be to anyone who loves freedom.

as for MJ being addictive:
i'm not even going to get into that other than to say that i have been addicted to several drugs over the course of my life and, even after prolonged heavy usage, i have never had a problem when i came time to give up weed for a while.