Fishy - still waiting for an answer to a very simple question. Why are you refusing to answer?
You say that it was forbidden to become unclean and deliberately doing so resulted in death.
If an Israelite shepherd found one of his sheep that had died during the night would he be executed for burying it?
If an animal that you are allowed to eat dies...1 - Anyone who touches its carcass will be unclean till evening.
2 - Anyone who eats some of its carcass must wash their clothes, and they will be unclean till evening.
3 - Anyone who picks up the carcass must wash their clothes, and they will be unclean till evening.