Describing Steven C. Miller’s The Aggression Scale as a violent Home Alone riff feels almost too retro-hip for my liking, but it’s almost impossible not to. The similarities between the two films are clear; pit seemingly defenseless children against brutish home invaders, watch the former embarrass and defeat the latter. But Kevin McAllister didn’t know how to work a pump-action shotgun, and possessed a much cuter propensity for violence. Owen (Ryan Hartwig), his analogue here, favors all manner of sharp objects and potent cocktails of ammonia and bleach. (They both admire the efficacy of a nail through the foot.) The clearer difference, though, lies in pathos– Kevin’s just a self-indulgent…