Heimdall by way of Detroit is not the main problem with Thor. It’s one thing to turn a heathen war god into a comic book. It’s another to turn him into a social democrat. Kenneth Branagh’s Thor was obviously meant to be a desecration, and it’s already passé to point this out. The casting is so deliberately clumsy that it becomes ironically racist. Idris Elba as the “whitest of the gods,”...