People rent detached homes to families all the time. My sister does it and I live next to a family who rents a detached home. Why would the viewpoint of owners be any different with renting apartments to families??
Detached homes are more isolated noise-wise, that's often not the case in apartments. If you rent out apartments, you want low-trouble tenants, not someone you might get a lot complaints about. That's also why many try to exclude people with dogs, they don't want to deal with dogs howling all day and neighbors complaining.
