This isn't the un-determinable question you've framed it as. Society defines what is and isn't acceptable all the time. > Who decides what is "societally-harmf

This isn't the un-determinable question you've framed it as. Society defines what is and isn't acceptable all the time. > Who decides what is "societally-harmful theft"? > Who decides what is "societally-harmful medical malpractice"? > Who decides what is "societally-harmful libel"? The people who care to make the world a better place and push back against those that cause harm. Generally a mix of de facto industry standard practices set by societal values and pressures, and de jure laws established through democratic voting, legislature enactment, and court decisions. "What is "societally-harmful driving behavior"" was once a broad and undetermined question but nevertheless it received an extensive and highly defined answer.