Because a private individual or organization has no incentive to create a certification that ensures my safety. Their incentive is profit. The whole point of a

Because a private individual or organization has no incentive to create a certification that ensures my safety. Their incentive is profit. The whole point of a government is to have a group unmotivated by profit, whose interests are its citizens. You cannot hold someone accountable without a government, because otherwise there's no way to create consequences. Having a private certification authority only adds a layer of indirection.