Last night’s opening of the Republican Convention was mostly on tape, with much official convention business occurring (and, on some cable networks, televised) earlier in the day. Donald Trump made two prime-time appearances, each time playing host, and interviewer, to a small group of people invited and assembled to tell their stories and praise their president: first responders and other workers in one group, freed international hostages in the other. (The second one, pictured, was cring