People just look at the structure of the economy and accept it as it is, and defend that status quo till death. It's honestly unreal how certain education systems can mold people's brains in a way that they are completely incapable of imagining any other system.
Landlords, at most, do a few minutes of vetting for their tenants. Then they just rake in thousands and thousands for literally nothing, like you said. Someone else mows the grass. Someone else fixes the pipes. Someone else repairs the roof. The landlord just pays those people with the money from the tenant. And if the landlord owns any substantial property, then they just pay a management company to pay all of those people for them. Pure leeches.