To paraphrase your last paragraph: "If your ideal system allows parasites, you're not entitled to use mechanisms (e.g. social stigma) to control those parasites

To paraphrase your last paragraph: "If your ideal system allows parasites, you're not entitled to use mechanisms (e.g. social stigma) to control those parasites."? Complaining about parasitic behavior is a form of social control. It actually comes part and parcel with the open source license. If you don't like people talking bad about free loaders, stay away from the open source community.