Eating is enjoyable, and to eat different foods is a different experience. Different smells, tastes, textures. Some people enjoy the experience of eating meat, they enjoy the taste, the texture. When they quit eating meat for ethical issues they still remember that they enjoyed meat.
So if you enjoy eating meat and only stopped due to the ethical issues, why wouldn’t you create a substitute?
It’s like a lesbian! Just because you aren’t attracted to a man, or don’t want to be with one, doesn’t mean you can’t enjoy a dildo.