Sorry, SA, that won't wash. Every adult had the opportunity to vote. Enough of the people who chose to vote chose a Labour candidate - result a Blair Government, (twice).
You could apply your mathematical logic to most recent governments, but the fact remains that you either vote or you don't, and the party that does best in the polls forms the government.
Or do you prefer the North Korean system?
One man- one vote.
And the man with the vote is called.........