Megan McArdle bemoans Trump's negativity and lack of policy detail, but eventually realizes that most people feel negative and don't care about policy details. McArdle and I care about policies, but most people just want their itches scratched, and Trump is doing it. There are a lot of people who are angry at being continually dismissed by the "elite", and they believe that Trump hears them and cares about them.
The big hits were praise of the police, attacks on Hillary Clinton, and anything perceived as making liberals look small. When he got into the part of the speech where he talked about what he might actually do, his audience started to look a bit bored, their clapping to sound dutiful rather than enthusiastic. Lucky for them, the policy section was brief. Trump's account of all the terrible things happening in America hardly left room for an expansive or detailed vision.
He promised to be splendid on trade, fantastic at stopping immigration, and the most magnificent tax cutter you've ever seen. How was he going to accomplish these things? By being awesome, of course. After a year on the campaign trail, Trump still hasn't really gotten beyond his own fantasticality as the basis of his policy agenda.
Of course, I'm not sure how much people will care. What the audience seemed to want was not so much someone to fix their problems as someone to validate their belief that these are problems -- problems that they feel liberals create and then systematically deny. As they say in 12-step programs, the first step is admitting that you have a problem, and if Trump seems like the only one who's willing to make that admission, then, well, isn't he one step beyond everyone else?
In her last paragraph, McArdle also twice applies the word "dark" -- the Left's attempt at a linguistic kill shot aimed at Trump. I wonder if she knows why she chose that word?