Isn't that the whole point? If legalization goes through and the crime is only localized to the U.S., then Mexico's supreme court reduced crime in Mexico.
Reducing crime by not calling something a crime doesn't help very much.
The crimes Mexican people most want to reduce are the violent crimes, the corruption, etc, all caused by people having to deal directly or indirectly with cartels if they want to produce/sell/consume drugs.
As long as the US keeps drugs illegal in their market, people will have to deal with the cartels to be able to sell there, and the US is the biggest market.
Well, guess what, that's exactly what helped in the US, ending the prohibition. Violent crimes, corruption etc. happen because people (drug users and drug sellers) can't conduct business legally. When they can, they use the police to resolve problems and generally abide by regulations, because it's simply cheaper to do business that way.
The crimes Mexican people most want to reduce are the violent crimes, the corruption, etc, all caused by people having to deal directly or indirectly with cartels if they want to produce/sell/consume drugs.
As long as the US keeps drugs illegal in their market, people will have to deal with the cartels to be able to sell there, and the US is the biggest market.