What's your point? Is there a statute you're thinking of that requires San Francisco to spell out specifically what their goals are? You said upthread that the lockdown is a violation of people's constitutional rights, but it seems clear that it isn't, at least not in our jurisprudence. You can find legal scholars debating the constitutionality of quarantine, but only in the context of hypothetical orders that haven't been issued by any state yet that would imprison people in their homes (the way China apparently did). If you don't even have the broad strokes of this right, it seems fair to ask for a citation here.