If you build the images, and you either source binaries from a clean source or build them yourself, then your images might actually be sane. People and companies can automate this, and some do as part of their orchestration strategy.
Most people want the promise of Docker but don't want to have to actually learn how to orchestrate, and shoot themselves in the foot with images they got from some random dude on DockerHub, and no matter how much people try to educate them it just never sinks in.