@CalamityJane,
Gálvez of course didn't come with a solid plan. The biggest thing she said is that she was going to build a "megajail" for the violent criminals. This was seen as the same "punitive" strategy of former president Calderón, responsible of the rise of violence in the first place.
Sheinbaum was also very generalistic on the matter. She kept on saying "we must adress the roots", meaning lack of opportunities for young people.
Máynez was the one with a more detailed plan. For legalization of marihuana, and fight against fentanyl and extortion by the cartels (which has risen with AMLO). For reinforcing State and local police, with better wages, instead of centralizing it in the militarized National Guard.
BUT, even if violence and security is THE aspect in which AMLO's government is the least approoved, it was not the center of the campaigns (maybe Xóchitl's slogan: "for a Mexico without fear").
The center of the campaign can be read as follows:
Do you want a powerful government that guarantees you social help in cash and pledges to fight inequality, or do you prefer a democratic government that cares about a balance of power, and only promises you not to withdraw the social help you already have?
The people chose overwhelmingly for the former. A strong democracy is less important than a personal wallet with at least some money.