What I can tell you is it's probably never been so brazen. Couple weeks back they shot the chief of Police of Mexico City in broad daylight in one of the nicest (most expensive) neighborhoods in the country. They killed his bodyguards and gravely injured him despite of having an armored SUV. An attempt like that was unheard of so far
The "cross border gun trafficking operations" you're referring to involved about 2k guns, of which 1/3 were recovered. Terrible bungling, surely, but a drop in the bucket.[1]
The CIA/Contra cocaine trafficking was probably far more consequential.[2]
The brazenness of the cartels comes from the insane profits they earn. They can buy off anyone, and if they can't they can hire anyone to get rid of them. And their insane profits are due to how scarce and illegal their products are in the US. Take away their economic base and they become far more vulnerable.
1. https://en.wikipedia.org/wiki/ATF_gunwalking_scandal
2. https://en.wikipedia.org/wiki/CIA_involvement_in_Contra_coca...
A decade ago, Chapo was burning tractor trailers on all the major highways in plazas to box his enemies in, fighting them for hours in broad daylight.
With that said, the homicides in Mexico have absolutely exploded under the current US and Mexican administrations, CJNG shot a helicopter down, etc. It's sad this escalation doesn't get more attention.
OTOH, I may not really think highly about how AMLO has done things, but I do applaud him for following a strategy to act against the structural causes. We have enough history on how the Militar strategy doesn't work, and actually a couple of examples where the "tough on drugs" guy is actually colluding with the drug dealers.
Then he captures the son of El Chapo, and because they began threatening the government they let him go. It's just a disaster. At this point my only hope Trump is reelected so he puts some pressure on him to actually do something about the problem.