Humus is not just soil, it is a community of living things. Organic matter is a breeding ground for many types of microbes, including bacteria and fungi which break down plant material, and for other microorganisms that help plants roots absorb necessary nutrients.
I agree with your analysis, but I disagree that cagers refers to an entire class of persons, all motor vehicle drivers. To me, and maybe I am not using the right definition, a cager is an @sshole motor vehicle driver.
Silencer, means you are watching a movie. suppressor, means you are IRL. there is no such thing as a silencer that I am aware of, a suppressor is a muzzle device that suppresses the sound coming out of the muzzel... but it is most definitely not silent.