I keep asking gays (pointedly my nephew) WHY 2 (also why not brother/sister mother/daughter etc.)?
I can give a rational basis for society supporting and subsidizing traditional marriage.
The only answer they can give is “’cauze I want.” “gay Marriage” merely means a contract between 2:n adults (for now) to share resources.
Such a contract provides no benefit to society so it won’t be promoted (all pro-family laws will be defunded) and thus will be ended (sooner or later and probably sooner).
Thus gay marriage ends marriage and with it society.
“Gay marriage” as provisioned by the state forces third parties into servicing homosexual behavior.