because The Sixth Amendment guarantees the rights of criminal defendants, including the right to a public trial without unnecessary delay, the right to a lawyer, the right to an impartial jury, and the right to know who your accusers are and the nature of the charges and evidence against you.
Hunting would not be able to support a large population that is necessary for a civilization. This is because of the amount of time that people will spend in looking for sustenance as opposed to engaging in other activities such as building