How are all the boys except Ralph and Simon and Jack behaving what is golden telling us about human nature what important qualities do wash Diamond piggy have that the other boys seem to lack

It's a bit hard to answer your question as written. Most of the boys have reverted to uncivilized behavior...... no rules, no expectations, no respect for others. This behavior tells us that without expectations and rules, most societies would fall apart and disintegrate into chaos without them. Ralph, Piggy, and Simon seem to have a more developed moral compass than the others.