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Well, you see, one is a cat. The other's people. But more seriously, cats evolved as carnivores and humans as omnivores.

Cats are obligate carnivores. They can't synthesize all the nutrients they need from a plant diet.

Actually neither are humans, unless there is some viable way to synthesise B12 in the intestine.

It is likely that early humans were insectivores too. Or there was some way to get B12 synthesising bacteria up in the duodenum.

Am I right that this is sarcasm?

In case I am wrong about this being sarcasm, the reason cats need to eat meat to survive is that they don't naturally synthesize taurine like most mammals.