That's just being honest about the impact of it.
To feature sex outside of marriage in a loving manner used to be mature audience material. Yet here we have underage sex, also mature material, and then homosexual material -- that was taboo.
Do I think young people should be able to read such material, or even be exposed to it in theatrical presentations? Yes! But packaging and context are key.
Glee is a package designed to indoctrinate by overwhelming the moral sense of the viewer, to entrain the young mind in a certain immoral and socially destructive ways of living. TV watchers are especially gullible. And the young TV watcher even more gullible than the old.
Glee is a moral trap to the innocent.
Aren’t they in high school?