Miaw
Funnily enough, humans on a bad vegan diet will get a load of health problems too. Vegan doesn't equal healthy. Vegan can be very unhealthy. You can find vegan food that is highly processed, high in protein and fat, devoid in nutrients. Just as you can for cats.
They might see an improvement in health from eating organic meat and some vegetables or something, but would see a vast improvement from going high carb whole vegan food. But they don't go that far, they just think then "meat good, vegan bad".
I'm not saying we have perfect vegan diets for cats. I'm saying cats are naturally vegan but their original food source is missing and whatever cat food you have tried hasn't replicated it sufficiently. Just how the ignorant human who eats vegan junk food then eats meat gets healthy and thinks meat is healthy and what humans need, the ignorant cat feeder will see their cat suffer on bad vegan cat food, get healthier on some sort of meat, and think meat is healthy and what cats need.
Cats will all die from meat-consumption. They simply will. If you crack the vegan cat formula they will live for a good bit longer, grow larger and be healthier, and die of something else.
:)