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> Crime free can happen without laws.

This is true in a very literal sense.

Laws aren't necessary in extremely smaller groups. Do you and your dog need laws?

You and your family probably have rules.

Very small communities don't even have police.

The larger the group the more need for laws to protect each other against ourselves.

What do you mean by law? If you mean a verbal or written rule, then any number of dogs have no laws by virtue of dogs being illiterate.