I've just quoted my GSIL's reply:
"Well as far as when and where we respond, it's whenever distress is called (hence major penalties for false distress) and wherever we are, good Samaritans are just that, people who assist as they are able and willing, just as in the parable, there are no social or legal requirements to assist; however, there are also NGAs that also assist, like TowBoatUS where in certain areas, due to their lobbying when there is no urgent medical requirement, we must allow them to respond within the scope of there technical expertise. Also there is a US code that specifically provides the uscg the ability to SEIZE civilian assets in major casualty events, think like 9/11, however I'm not familiar with which code or what thresholds must be meet to impose it. As for demanding compensation, since in the eyes of the law the uscg is a law enforcement agency we are legally obligated NOT too receive compensation, donation, or gifts. But at the end of the day barring outside agreements with civilian businesses the coast guard must respond within the limitations of the vessels we operate and the capability of our operators Good Samaritans are supplemental, not a replacement. They usually assist searches and occasionally transfers to and sometimes through the coast guard's arrival"...