Communism where disabled people are consider “bad actors” who “don’t contribute” loses a lot of its appeal. If you can kick people out seemingly arbitrarily then it’s not a social safety net.

I think by "bad actors" they meant psychopaths and malignant narcissists who would aim to take over the system for their own gain. People like Stalin. The problem at scale is figuring out who these people are, and keeping them out of exactly that system. Unfortunately even the American system of checks and balances can't really keep psychopaths out of high office, so it's an unsolved problem of how to deal with this.