There are a thousand crappy studies out there carried out with the explicit (although often unspoken) goal of demonizing vaccines by "proving" that they cause autism. Indeed, over the last 12+ years that I've been blogging here, I've deconstructed more such studies than I can remember—or would care to remember if I could. Unfortunately, if there's one thing I've learned about some of these studies, it's that they're like the killers in 1980s slasher flicks. You remember them? Killing machines like Jason Voorhees or Michael Myers, who mowed through teens misbehaving (often by having sex) for…