I agree with you that we are all intrinsically egoistic by virtue of our experience as ourselves and our interaction with others around us. I also agree that a baseline principle of equality and fairness should extend to all members of a community / society in order for us to enjoy any real sense of freedom. But your description of your intervention with other’s projects based on your own ethical judgments seems a somewhat dangerous one. Imagine a person who, based on their particular ethical commitments, performs acts of violence in an attempt to save or protect others. Can there be a line drawn where intervention (physical or otherwise) is no longer justified?