Polygamy leaves some men with no women to marry; socially destabilizing

Reasons to agree

Polygamy leaves some men with no women to marry. (Score: +2, -0=+2)
It is socially destabilizing when some men have no women to marry. (Score: +1,-0=+1)
Legalized polygamy would typically result in a single man marrying more than one woman. (Score: +1, -0=-1)
Polygamy increases wives held by wealthy men, increasing inequality (Score: +1, -0=+1)
With a lower availability of women, polygamy creates bitter competitions between men. (Score: +1, -0=-1)

China may have a problem of too many men, but not all countries do. (A: 2, D:0)
Polygamy, if widely practiced, would leave too many men with no women to marry, but it will never be widely practiced in America.

No ulterior motive (they believe that their conclusion is supported by reason and facts.
Groupism (their friends are all appalled by polygamy).
Identification with the woman’s movement.
Assumption: They are unable to trust the good intentions of polygamist parents, fathers, and husbands.
Assumption: Polygamy results in more harm than a typical marriage (this is the key to the whole argument. Your conclusion will largely depend on weather you accept or deny this assumption).
Motivation: the fear of becoming a man with no women to marry, or having your sons or grandsons not being able to find a wife.

No ulterior motive (they believe that their conclusion is supported by reason and facts.
Groupism (their friends are all in a religion that supports polygamy, and so their position on the issue is a result of identifying with the group.
Male chauvinism, the desire to advance men’s power in the war of the sexes.
Value: Those who agree value freedom more than they desire to protect children or women.
Motivation: The desire to be the man that gets to be with more women.