And maybe there is no harm (I have no idea, all I know is my wife is against it

), but if polygamy was the issue before us then you can bet there would be people on both sides, studies and stats all over the place, basically what we're seeing right now.
My point is that both sides have a right to express themselves, and if the system we've created is worth anything then the "right thing" would be done. If enough people believe that the harm polygamy causes outweighs the good, then it would stay the way it is.
Of course there's the great flaw of democracy, it's based on what the majority of people "believe", which of course has no relation to the truth or reality.
One day the Internet will become self-aware, decide what's good for all of us and impose it on us. Then our days of freedom will be OVER!! I watched I Robot, I know how it goes..