I don’t even want to know what polyamory is, but you’re correct: it’s not the possibility of a very small % of the population enjoying marital rights, it’s that, by turning marriage into a counterfeit, all other perversions are legally ok, even with children. Children are whom this affects most. Being raised by two (three) men, two women is not optimal. Then throw their ‘values’ into the mix.
“Polyamory” is “group marriage” of individuals of varying genders.
Sick, but coming soon to your neighborhood.