Who cares if the Mexican cartels are upset that Americans take over their business? Are we supposed to be afraid to do something because it’ll upset the Mexican criminals? What’s to stop them from also extorting restaurants, liquor stores, candy stores, etc? Let them work on importing watermelons or something else, I don’t care.
These are serious criminals who will never simply go away. Even if they don’t muscle in on legal pot shops, they will divert their resources and sinister genius into other illegal operations, like child prostitution or harder drugs.