I think the author is mixing up a few different topics. If you're going to blame container frameworks for people sharing software in insecure ways you might as well blame the fact that executables are portable between compatible systems. Might as well blame the fact that there's a network while you're at it. We run docker throughout our infrastructure, but it is a deployment and dependency management technology, not a vector for infection. We run only our own images, which are all built from source or validated binaries. So what do insecure or unreliable practices have to do with containers, specifically?