I think it's fair. I never smoked, drank, or did drugs when I was a teenager. And I was a teenage boy!
Teenage boys are very different than teenager girls. We're conditioned differently, so we react differently. I think most of the girls on this show are stupid, regarding the choices they have made, but I see women in their 30s making the same choices for the same reason these little girls do: they don't value themselves. They value being "loved" by someone, esp. someone who doesn't love them back. They want to prove they're worthy, they want to "fix" either the boy/man or themselves to fit into the fairytale they want life to be.
I was much better behaved than the girls on this show as a teenager, but man, if you would have recorded my tears over the boys who I "loved" and didn't treat me right? I would have looked like a moron. While the girls on this show annoy me to no end, I recognize that they are only teenager and they are dealing with typical teenage emotions as well as ones they weren't ready for, the emotional ties of having a baby and being linked to someone, the swift and complicated hormone changes from pregnancy, etc.
Sadly, until we teach women to value themselves more, we're going to keep turning out the train wrecks on teen mom.