The way I see it:
Short people are more energy efficient. We house a soul just as large as that of taller folks, yet it takes less natural resources to sustain that soul.
Think of the resources we could save if we were all short. Buildings could be shorter...saving much raw material. Clothing would require less material.
AND it took much less food to get me fat than it would to get YOU fat.
;-D
But then nobody would see the spectacle of me blushing when I speak at my eye level and then realize the target for speech is far higher than that.
*chuckle*
Maybe evolution will bare that out....