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Because lions live in savannah...
If they lived in the artic they'd be white.
If they lived where there was shadows they'd be black.
If they had multiple colorations in the same breeding population, they'd have calicos on occasion.
Anything except savannah color is a disadvantage, so that's all there is.
To expand on this, if they lived in the arctic, there would be "selection pressure" in the form of either reduced hunting success for predators or increased predation for prey species. That selection pressure is really all that evolution is: being more likely to succeed and pass on your genes.
Also, modern domestic cats are the result of breeding. Wild cats mostly reflect their environment in their coat.
I think Darwin might be on to something...