In the case of compost in your garden, the problem is food safety and having a nice garden. The first problem is that rotting meat stinks, and attracts flies and rats that can spread diseases, and it is not something you what in your garden.
The second one is that your meat can contain bacteria that then live in the compost and contaminant vegetables you use it on.
You can compost meat and dead animals there is a lot of instruction online for example compost cattle that have died. You need to cover it very well to keep scavengers away and have absorbent material below it. You also need to let it take enough time to finish. Even if it starts to stink that is not a large problem on a farm because you can do it away from where you live. So a lot harder than just composting plant products.
There can also be bacteria in the water that run off the pile so you need to keep it far enough away from any stream or when you just grow food to eat.
So impractical in a garden you just add material on top where it is close to where you live but possibly on the scale of a farm where you can cover it very well directly and let it take time to decompose away from anything that could be contaminated with runoff.
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