Why don't we eat people?

Why are people opposed to cannibalism?

Why can’t people donate their bodies for food? It seems logical that a person who dies accidentally could have their organs harvested and then the remainder of their body prepared as food.

If this were to be feasible (in terms of keeping the body preserved and edible after transport), why would anyone have an issue with this?

I can understand that some people simply may not like the taste of meat and thus wouldn’t enjoy eating human. But I fail to see why anyone would find something wrong with this.