

Here in Europe elements like healthcare still fall under socialism.
Im not sure how the Mexican government operates, but typically it’s not all-or-nothing. Just because a socialist gets elected doesn’t mean they suddenly have the power to completely overturn a country and kick capitalism out. Such changes would require overwhelming majorities.
However, socialists would strive to implement those elements of their idealogies they can.

A socialist does support moves beyond capitalism, but in a representative democracy they wouldn’t have the power to do that outright. So it goes in small steps, starting with checks and regulations to prevent capitalism from going rampant (like it is in the US).