I'm sorry to hear about your cat... I know that loses are difficult. The idea we are discussing here is mainly unwanted litters of puppies and kittens. Adult animals are involved in this issue, but the point is that animals are euthanized in shelters, why not use their remains to feed another creature? Their bodies would just end up in a landfill anyways, doing no good whatsoever. In my opinion, people who have loved and cared for their pets get to do whatever they want for them... whether it be burial, cremation, etc.
Again, I'm sorry for your loss...