And your problem with that is...? Is that a question that shouldn't be asked?
Well, if we are going to talk about absurdities in evolution, how about this?
First, how are humans able to perceive beauty, or even desire to see it?
A beautiful sunset or the clouds in the sky have no evolutionary advantage.
The capacity if not tendency toward beauty defies evolution.
And what about beauty in a mate?
What men desire in a women is ANTI-evolutionary.
Evolutionary pressures would favor selection of RUGGED, strong, resilient females — not delicate, easily-broken females.
Smaller women have difficulties with giving birth to large babies. Larger babies at birth are more survivable and can grow to be self-sufficient more quickly.
So if evolution were true, men would desire women as large and rugged as they are — not smaller, more slender, more delicate women.
Fat women should be more attractive because a woman (a) with energy reserves and (b) the capacity to acquire lots of food would be more likely to successfully reproduce healthy offspring.