I’m on my way home from Denver, where I testified as an expert witness at a deeply troubling trial—a trial that’s become way too common in America. Here’s the situation: The defendant “Mr. Jones” goes into a Yahoo adult chat-room, and makes it clear he wants to have conversations about sexually dominating a young person. A person responds—let’s call her “Missy”—who says she’s a teen who would gladly chat with a wiser, older man about the ins and outs of sexual things. “Missy” says she’s 14, and she and “Mr. Jones” proceed to exchange hundreds and hundreds of emails, IMs,…