“Wise parents give their children a lesson of morals along with education.”- Chanakya.
Without morals education can be really harmful to society, and at the end to that person too I believe, after all, ninety nine percent people reap what they sow in this world, and that theory applies to crooks too, no matter how smart they are or they think that they are! So, in the end a little ethics lesson is good for everyone I believe.
Why parents not schools? Well, I believe kids are mostly a fistful of clay that parents give a form before handing them out to school/society to finish up the doll.