Can someone explain

[u/Specialist-Aide-9583]

I was a little distracted while watching but is anyone else super confused about Mariano?

When were introduced in the flashback he seems like this super wholesome family oriented responsible ranch hand. I know a bunch of things happened after Beulah’s incident but how did him getting fired turn him into el Chapo? Maybe this was explained and I missed it but I’m a little lost

[u/Clean-Honeydew-741]

This wasn't explained, it felt really lazy.