You are doing your cat a huge disservice. Please visit (commercial link removed) before you continue feeding your cat a vegan diet. Just because the cat is eating it does not mean it's good for the cat. Humans can be vegan because it isn't necessary to eat animals for our health. Cats are not human, they need meat for health. That is how they are designed. They do not engage in cruel, inhumane behaviors. They simply hunt as they are designed to do. Please do not project your human issues onto animals.

I do love cats,and all animals .
I do not believe that children cannot live and thrive on a vegetarian diet. However i think is not the same argument.
Humans can eat and process a variety of food, our body are made for it, some animals are designed by nature to consume flesh:teeth,digestive system,metabolism. I don't think is a matter of new science etc,it's a fact.
Taurine is for instance essential for the health of a cat,since they o not synthesize the compound, causing conditions like CRD and DCM.
How are these nutrients essential to cat health introduced in a vegetarian cat diet?
Due to the cruelty of animal testing, i'm try no to buy any supplements,so for me that would be a dilemma...
I love animals, and indeed i wish and hope to see the day that our specie will stop to view them as a disposable comodity to be use for our benefit,
but i think that the arguments are not so black and white.As i see it the responsibility i have toward the animals that humans domesticated is to let them live according to their nature not my sensitivities.

Thanks for let me express my view.

The best thing for the planet is for humans to not keep pets, full stop. No need for any pet food then - vegan or not! Cut consumption. The native birds would appreciate it. And farmed animals - stop breeding them and let them all die a natural death. Then we can all get along with just plants to eat and wildlife - and even other humans! - for company ... :)