I would never feed my cats a vegi diet just cos I am a vegi, but I couldnt face feeding raw, and they dont get 'proper' meat a lot, but they do get meat cat food, and their treats are food that is 60% meat, which is a good compromise in my opinion.
I despise the idea of cats having a vegetarian diet...and I too used to be a vegetarian myself. I wouldn't dream of forcing my dietary habits on an animal designed to be purely carnivorous!!!! I think that mentality is selfish, and it hardly puts the welfare of the animal first.