In dealing with an American adult who actively pushes for gun control, one must apply a simple rule: Assume malevolence. Twenty-three-year-old Harvard graduate David Hogg, a survivor of the 2018 Marjory Stoneman Douglas High School shooting in Parkland, Florida, and barely an adult, might have more surface-level excuses than other prominent gun-control activists, but he remains a malevolent actor nonetheless. During the question-and-answer session of a debate on Wednesday with former Libertarian Party vice-presidential candidate Spike Cohen at the Dartmouth Political Union in New Hampshire, Ho…