Because range voting embraces the property of valuing votes differently per voter. Implicitly, range voting gives more weight to voters who are aware of the to

Because range voting embraces the property of valuing votes differently per voter. Implicitly, range voting gives more weight to voters who are aware of the top two candidates and can strategically rate one much lower than the other, even if their opinions of them are approximately the same. Valuing one voter over the others like that is a dangerous road to travel down.