The “death do us part” thing is a tradition, but marriage is a legal status. Not everyone is going to follow that tradition, and surely you wouldn’t argue this ought to bar them from the legal status

incompetent

No, malicious. Racist in fact.

Suburbs were intentionally designed to be hostile to families without a car. This created a financial barrier to living in the suburbs, organically weeding out “undesirable” (aka non-white) families. Yes this also meant that many white families also couldn’t afford to move to the suburbs, but that was a downside the rich white racists were willing to accept if it meant keeping most non-white families out.