Aside from what filmmaker Ari Aster is doing these days, emotional horror is not really a thing, or a recognized genre yet, but let’s justify its existence. Especially given we lived through the existentially withering horror of 2020, and an age when half our society demands more empathy, and the other half is brutally resentful that you’d dare ask such a thing. Take Aneesh Chaganty’s new horror-thriller “Run,” a Hulu movie about a hyper-controlling mother taken to new sociopathic heights. More specifically, a psycho control freak mom who does unspeakably horrible things to her daughter, “Run” is built on some of the most frightening betrayals one can imagine between parent and child trust, even more so when you consider mom as caretaker and daughter as a physically disabled wheelchair user dependent on her. The premise is so terrifying to consider; it actually gives you the chills without even knowing the details. It is stuffed to the brim with the stuff real rich emotional horror is built on.