Death is a strange thing.
I guess some people might be uncomfortable with the cat helicopter, but the cat was hit by a car, not killed to create the helicopter. I think that the owner of that cat, in his own mind, was honouring him by doing that. It's not what I would have done, but maybe we all have our own ways of paying tribute to our lost friends. Who are any of us to say which is the most appropriate way to dispose of a dead body? I was raised to believe that the best thing is for a dead person to be taken to a special place to be burned, at great expense, leaving all the work to be done by professionals. Now I'm in Portugal, death is much more hands on and I've had to prepare bodies myself, and sat up and watched over them overnight, not leaving their sides until they are safely buried in the local cemetery, knowing that in seven years they will be dug up again to make room for more.
How you treat your friends in life is much more relevant, in my opinion, than any 'rights and wrongs' about what to do with a body after death. It looked to me like that cat had a decent life and was much loved by his owner. If he'd been mine I would either have buried him or put him in the
compost pile, either way making sure that he would once again have become part of the cycle of life that I am creating on my land. But I also have total respect for someone doing things differently.