I think it’ll be worse - like the Mafia in Sicily and elsewhere, the cartels also provide services to the folks seen as forgotten by the Mexican govt. Having Americans roll in (or support the govt which they already distrust - as
@Humphrey Bogart says, up to 1/3 of Mexican govt officials are on the take) won’t endear them to the locals in a “hearts and minds” campaign.
Also, from the article below, the Mexican govt hasn’t exactly been covering themselves in glory taking the fight to the cartels.
Violence continues to rage more than a decade after the Mexican government launched a war against drug cartels.
www.cfr.org