To have peace and prosperity requires democracy

To have law requires that there is a state because otherwise we have no authority and no rights. Without a state when a crime is committed there is no means to (objectively) determine which party is in the wrong and which has the true claim to ownership of property. Without a state there is anarchy which is chaos and lawlessness because to determine who is the criminal in a dispute requires a third party opinion by definition which then is a state. To have peace and prosperity requires a state and so then it requires democracy. But if we have a first-past-the-post (fptp) system this is not fully democratic because there are systems which are more democratic which are available. To threaten democracy is to threaten the state which is to threaten peace (for the reasons given above) and so then fptp is a threat to peace.

Democracy is peace unless the state itself is always criminal (or if states can exist without democracy) and so then there is no reason to reduce democracy by using a fptp system (to do so reduces peace). If we reject pr then we are rejecting democracy itself which is to reject peace. But since peace and lawfulness are good then to reject pr is to reject something which is good… which is bad. Democracy improves the state because it makes it more accountable which improves the ability of the state to uphold justice.