It's hard to make good stupid TV.By that I don't mean "so bad it's good" or any other phrases so worn out they've ceased to have meaning. I mean a show that is about something stupid, and knows it's about something stupid, and somehow makes you care about that very stupid thing. These are usually (though not always) genre shows, and they often have tones that vacillate wildly between deeply serious scenes and outright camp. They often struggle to get that mixture just right.The Strain experienced that exact struggle in its first season. Outside of a couple of solid episodes (and one genuinely entertaining midseason hour), the vampire drama always felt like it was trapped by its own desire to be taken seriously. It could have been gloriously silly, but the show was on FX and, thus, too good for that.Things did not look much better headed into season two. Where the goal of the first season was to kill the Master, the head vampire, the goal of the second season is to find a book. That's right — the second season's major goal could be accomplished by checking a card catalog. (Okay, it's more complicated than that, but give me my joke.)And yet The Strain has slowly wormed its way into my affections, as surely as one of the show's vampire worms burrowing into a victim's eye. It has figured out how to be stupid and entertaining, all at once. How? Read on.