> However, the final example is a bit puzzling, because point 6 does not follow from 5, 7 does not follow from 6, and 10 does not follow from the previous point

> However, the final example is a bit puzzling, because point 6 does not follow from 5, 7 does not follow from 6, and 10 does not follow from the previous points because of the addition "if that preventive..." comes out of nowhere. It would be better to make the missing premises explicit. 6 follows from 4 and 5 by modus tollens. 7 is just a rewording of 6. "any ... which causes harm" -> harmful and "more highly than, nor equal to," -> "less highly than" 10 indeed does not follow because no premise provides a way of assessing effects of one behavior on another. However the phrasing "if that preventive" simply is a conditional referencing the object described in the consequent, "whatever prevents the harm"