There was a time when we thought Mexican institutions would resist. I am from Chihuahua Mexico, and we thought this was just happening in the rural isolated areas. Then it spilled over the cities too. I have had family killed. Smart and educated, like you or me.
American and Canadian institutions are stronger. They have been able to stand.
The richer the country and the stronger its institutions, the less likely cartels will take over sure, but when $40 billion USD in yearly profit (in the US drug trade) are up for grabs, someone's going to be stepping up.