They know in their consciences that what they are doing is wrong, but they won't accept that. Anything that points this out to them must be silenced, and what better way than to begin brainwashing people from a young age.
Psalm 12:8
On every side the wicked prowl, as vileness is exalted among the children of man.
Yup, too bad that kid that is forced to eat vegetarian lunches, cant say anything to the school lunch lady, teacher, or principle about wanting to eat meat. The schools hands are tied.