A five year old does know right from wrong.
The law doesn't think so. The schools don't think so. The Church doesn't think so. The Bible doesn't think so. The parents don't think so. The courts don't think so. ONLY you think so! If children knew wright from wrong, they'd held accountable for wrongdoing, they could be prosecuted for crimes. There seems to lack reason in your faith on this subject. And, pray tell, at what age does a child begin to know the wright from wrong? Is it at 3, 4, 5? With your thinking I am not surprised at the conclusions you reach.