Under what circumstances is it moral for a group to do that which is not moral for a member of that group to do alone?

It seems to me that any law that is not enforced and can't be enforced weakens all other laws.

Sick cultures show a complex of symptoms such as you have named...but a dying culture invariably exhibits personal rudeness. Bad manners. Lack of consideration for others in minor matters. A loss of politeness, of gentle manners, is more significant than is a riot.

Do steers make treaties with meat packers?

The less respect an older person deserves the more certain he is to demand it from anyone younger.