You can't ask a question like that without a skeptic jumping into the fray quickly with the obvious answer to the question I have asked for years. The answer, in my opinion, is that they aren't visiting us at all. Its the same question, if they are so advanced, why do they have to physically kidnap and probe people? Don't they have body scans? We do! If they were really so advanced and so interested in us, they would be contacting us in a way they knew we would understand, through direct communication, not years of crazy stuff that they know doesn't happen on the norm. They aren't visiting us is the easy answer to that question.