He mentioned Tijuana for instance is already carved up amongst the various crime organizations. In his opinion it will not help Mexico though it perhaps will not hurt it either.
Personally I think the corruption goes from the top to the bottom and don't really see a quick fix. There would have to be real consequences to taking and giving bribes and other steps like that to re-enact the rule of law. I must say if I was a Mexican cop and told "take our silver or our lead", I'd probably take the bribe too so not really passing judgement. :-/
I have been downvoted all to hell whenever I suggest buying drugs is supporting these murderers.
Has the (thoroughly corrupt) PRI being back in power made the violence better or worse if you know?
Somewhat unrelated, but reinforcing your point about it being corrupt, we keep finding that president Peña Nieto owns quite a few houses he shouldn't be able to afford: [3], [4]
[1] https://en.wikipedia.org/wiki/2014_Iguala_mass_kidnapping
[2] http://www.oas.org/en/iachr/media_center/PReleases/2016/023....
[3] https://www.theguardian.com/world/2016/jul/18/mexico-preside...
[4] http://fusion.net/story/337255/jorge-ramos-another-scandal-p...
But we are talking about closing a big revenue stream for the cartels, almost certainly one of the two or three biggest they have, maybe even the largest, just by lifting the prohibition on marijuana. That's not only a step in the right direction, it is a rather big one. In the long term, treating drug addiction as a medical / consumer protection issue in the US rather than primarily a law enforcement one, will be a huge boon towards the future of both nations (and, again, other nations in the Americas that I am not excluding but for which I feel less qualified to speak about).
In short: it won't magically fix the problem, but I do believe it will likely reduce the number of deaths and put us in a path towards a solution.
[1] For the HN libertarian crowd, I don't mean solving income inequality in the sense that everybody should make the same regardless of economic output (although I do believe on a safety net), I mean changing a centuries long setup in which class mobility is near zero and strongly correlated with race, and where most large scale "entrepreneurship" in the country is based of political connections (see telecommunications and media industries in Mexico for example).
Having grown up in Mexico, reading Mexican press and seeing the endless amount of mass graves people are now finding through the country (e.g. [2]), I am fairly sure there are plenty of cases not counted in the official estimates.
[1] https://en.wikipedia.org/wiki/List_of_ongoing_armed_conflict... . Note: If this makes you scared about planning to visit Mexico, please also remember it is a very large country, and different areas have different levels of violence. Fourth largest conflict in terms of total yearly deaths doesn't mean "it feels like Syria" on account of the population being 100 million. But that doesn't change the vastness of the cost in human lives...
[2] http://www.bbc.com/news/world-latin-america-33671636