How is docker container, running a process as unprivileged user with reduced capabilities security disaster? With Kubernetes you can even have network policy or service mesh with mTLS. Compare it to bunch of bare processes running on the same machine, lots of services listening on localhost, difficult updates due to different dependency version requirements by different software, requiring you do the manual, painful update only once a year. It may look bad at first, but container can be far more secure that common non-container environments. It's always matter of configuration and maintenance.