I think part of the problem is that the parents tried to prevent their kids from knowing that tight pants and modeling were things that existed. They simply tried to make sure their kids didn't even know what sugar was. If they didn't know it existed, they wouldn't desire it. If the parents couldn't prevent their kids from learning about these things, they just said, "No!" "Evil!"
When I see the choices that Micah and Moriah are making, I cringe. Micah is getting lots of positive attention for his modeling. Moriah is likely getting lots of positive attention, as well, and, let's face it, those pants are super comfortable. But neither one of them actually has any experience have a friendship or a relationship. They are going to make some big mistakes, and it is going to be tough.
Parenting is really hard. It's hard to see your kids making mistakes when you know better. But their are some things they have to learn through experience. Mom simply saying, "That's evil," is not going to do it.