Strange isn't it that if you go to Mexico you'll find plastic litter along the highways to an alarming amount. I don't think that's an indication of their callous disregard for the environment. The callous disregard is on those who have made the decision to not pay a refund to recycle that plastic.
Maybe there's a reason why they can't because of monetary restraints, but I doubt it.
No, it is disregard. The closest nature trail near me where people go for walks and bring their dogs or whatever, people litter there all the time and leave their discarded box of Timbits or coffee cups etc. Some people are dirty selfish a-holes who don't care about anyone or anything else but themselves. Mexico has a lot of those, and also not the money to clean up after them.