Quote Originally Posted by Monty92 View Post
True majority opinion - an opinion that we know exists because the margin of victory was sufficient to discount arbitrary factors as having swung it.

Your other points are entirely valid. But I fail to see how you can argue against the suggestion that the larger the margin of victory, the more certain we can be that a true majority opinion exists.

That this is ultimately insufficient to make it a good idea as an electoral system, we can agree on.
But arbitrary factors are part of the deal, I'm afraid How a given voter feels on a given day is what counts because we sort of assume they're adults and have actually thought about it before voting. Anything apart from where they put that mark is meaningless because - whatever other factors obtain - the result on the day and is the only thing that matters, regardless of the narrowness of victory. Demanding that the result of a close vote shouldn't count is like demanding that a flukey last-minute goal shouldn't count in a close football match.