The welfare of your society depends on your well being because you are the human being that can shape the society you choose to live in, therefore making it your own society. Your well being is the main factor, that includes mental and physical health. If your wellbeing isn't healthy the society you choose to live in will be unhealthy also, same vice versa.
It says that people will only be truly free once a socialist society will be present in the world where no classes which divide and remove the freedom of certain people will be present anymore. Having said that, the communist manifesto wants the world to become an utopian socialist society where freedom will be widespread in its true sense.
Martin Luther King Jr., in response to those who asked him why didn't he call for negotiations, says that is exactly the purpose of the nonviolent direct action. To create a crisis and create the tension that will lead to negotiations in society that has for a long time ignored the problem and the requests for any kind of negotiations.