Daas Yochid,
My understanding (and I know I may be wrong) is that if the government decided that it was “necessary” for the good of society they could and would dispense with those restrictions (eidim and haasrah) and lock the person in jail and feed them barley until his or her stomach burst.
Also would publicly protesting a decision of the King be considered a Mored B’malchus? If it would be then protesting something the government decided would get you killed as well and I’m not sure you need eidim and haasrah for that either