If you think that the cartels and such are not involved with legal weed I don't know what to tell you. It's not that we have to have a war on drugs (which is EXTREMELY overblown in regards to weed atm unless you are a dealer or part of the cartel)  it's that legalization is not necessarily the best for our society.  It is very damaging, but I have met 0 users who would admit that so I don't expect anyone to. I kept an open mind about it until there were too many people I knew damaged by it. If it were already legal I probably wouldn't say we should make it illegal but since it's already illegal it should only ever be legalized for Legitimate medical use.