It’s not just drunk driving. The alcohol promotes lots of other crime. There’s a small farming town (actually several) near me where the police say they have one of the highest crime rates in the nation, but insist you’re safe as long as you stay away from the bars on Main St.
Many Mexicans have a high percentage of "Native American" admixture in the gene pool. The result: IMHO, lower-end Mexican "culture" is very drunken, and extremely violent.
I can understand why this might be considered a "racist" statement. But if law enforcement personnel is made as aware of it as they are of the extreme alcohol and substance abuse problems around Indian Reservations, it might be useful.
There's another thing. When I've been in Mexico I noticed most people don't drive or have a car. I think many of them don't 'get' the entire concept. It's something we all do and they don't. Much of this is not just blending cultures, it's a feeble attempt at blending centuries of development and lack of it.