legal weed could definitely remove the appeal and profit made from illicit dealing
thats my thinking anyway...
So why not do that for meth, heroine etc?
meth and heroin are man made drugs, have to be made in a lab by chemists and they are highly addictive, people will just about anything to get a fix... MJ is non addictive, people don't rob and kill others to get more, and can be grown just about anywhere by anyone... if these people were killed because of the weed, then it was about money, not weed...
Heroin is a derivative of opium, Opium being a natural plant product from the poppy plant. It is highly addictive. So by your logic, as long as it is "natural" it should be legal.
Also, There have been many killings over weed, saying it's about "money" and not the weed is disingenuous. People kill over meth, heroin for the "money" that the dealers make, not mainly for the drugs themselves.