1) Like homosexuality, it's one of those things where the stigma against it is primarily custom-based. People have a strong knee-jerk negative reaction to it, but there aren't necessarily very good reasons for that reaction.
Uhhhh... most guys can't support one wife and one child without Herculean effort. If you want to see our welfare rolls explode and even more dysfunctional children then by all means encourage polygamy.
Time warp to the 1950's? Most wives today also can work, you know.
Uhhh... yeah. Two income household. TWO people sharing TWO salaries. You start adding other women and a geometric increase in children and the guys end of bargain isn't just being split two ways, man.
This is an absurd argument man. For every mouth you add, you also add another hand.
You're making an argument for why Hasidic Judaism is economically infeasible... which as we all know is not true either.
Well, it sort of is. There's a reason places like Kiryas Joel and South Williamsburg are so poor. They only survive by living off a welfare state that subsidizes having absurd numbers of children. (The same as it is in Israel, though it's a much larger problem there as Hasidim are a non-negligible portion of the Israeli population.)