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.
Keanu Reeves' Arch Motorcycle Company presents its first bike: The KRGT-1. You hear plenty of stories about what a stand-up guy Keanu Reeves is when the cameras aren't rolling â and now it makes sense. Turns out he's a madly passionate motorcyclist, which in my books makes him a superior human being.