Why are decomposers and detritivores important parts of a food web?

Scavengers are an important part of the food web because they clean up the environment. Imagine a lion which is a carnivore hunts its prey and is feasting on it, they only eat the good parts they do not eat every part of the animal. They leave the rest of the animal to decompose. The scavenger comes along like a hyena and will eat the remains of the dead animal. Less dead animals rotting in the Earth the better the environment is.