Most Challenging and Age-old Issue for Class Discussion

Daryl asked a most interesting question: who is anyone to say that another's thinking is right or wrong?

This would be a most fundamental and provoking issue to discuss in class (both 4-4 and 4-8)when school reopens (haha ... evil laughter):
Are there fundamental rights and wrongs (of values and morals) in society?
Who decides what's right and what's wrong?
Do rights and wrongs differ across cultures and time?
Discuss, and provide concrete evidence and examples to justify your statements.
(Do examine historical and current examples.)