That's because they have parliamentary bodies that divvy up the seats based on vote diversity. We don't.

Also, I don't think that's the way to do it - it *still* reduces the voter's intelligence and opinion to "only one!", which offends my sense of decorum. Instead, it replaces the voter's inner spectrum with a spectrum chosen by... tada, the gummint.

I'd rather have our system of legislative bodies, but with a ranked voting system. Best of all worlds in my opinion.