Well, due to the governmental safety nets (welfare) due to anti-marriage actions of way too many...including dead-beat dads...govt. has a "Vested interest" in ensuring that just any ole "configurations" become so-called "marriage."
They pay the bills for failed families. And faulty configurations only ups the total of failed marriages.
(Example: Those who cohabit before marriage greatly increase likelihood of divorce)
Take back the language!