Political online game and economic simulation

Allowing polygamy should increase Civil rights and decrease Discrimination indexes.

... In a very idealistic and protective form, maybe. But did you consider that this decision will also legalize (otherwise illegal) practices of fundamentalist religious group, as the one that is taken as a motivation for the task?

The task option talks about legalizing consensual polygamy not abuse. It is similar with incest: consensual sexual relations between grown-up relatives should - in a free society - be tolerated, abuse shouldn't.

The state, however, will now have a harder time to determine where consent begins and abuse starts.

Furthermore, you have to keep in mind that this task is for all states. You may legalize polygamy in a religiously played state with less idealistic goals. The fact that the outcome of this option has rather "neutral" effects accounts for many different developments from that point onward, and therefore, in my eyes, is an overall good compromise.