Teaching kids how to be good humans is a collaborative effort between their parents, teachers, and all other adults in their lives. It truly does take a village, and if the adults closest to a kid aren't on the same page regarding standards of behavior, it's much more challenging to make them into good adults.
Even if we don't agree on all the nitty-gritty details, some core values should be instilled in every child: don't lie, steal, or be violent. These are pretty basic things that make up most frameworks of basic morality. If a kid is caught doing one of these things, it's not like he should be tarred and feathered down the high street. But this behavior shouldn't go unacknowledged either, and anyone who thinks it should is not doing a great job of raising good citizens. One teacher caught her young student trying to steal a tablet, and her parent's reactions were somehow more disappointing than the attempted thievery.