The problem is Mexico, not Mexicans in general. To be more specific, Mexico has a deeply entrenched culture of corruption to go along with a de facto aristocratic/peasant tradition which fuels political support for socialist policies to go along with the corruption. It’s not just the drug gangs and the ultra violent kidnapping for profit gangs, it’s the cop and the petty bureaucracy which demand bribes from everyday Mexicans to simply do their jobs. This is a cancer for any society. It breeds contempt for the law. You can see it even in the way they drive - ie no rules, no wait your turn, no order or discipline.
If Mexico were not a neighbor of the US such that it benefits in a myriad of ways ranging from no military threat to direct financial aid and a bailout if necessary like in the mid 90s, to American tourists in large numbers, to a pressure release valve in the form of millions of Mexicans who have crossed the border and sent remittances back, it would be a failed state.
The problem is Mexico, not Mexicans in general.
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The reason Mexico is the way it is, is because it’s full of Mexicans.
Mexican culture comes from Mexicans.