The crimes we're talking about here aren't "the crimes every American commits while squeezing orange juice in the morning" crimes.
Meanwhile, it is extraordinarily difficult to catch people in the act of committing computer crimes; the most effective investigative approach to enforcing computer crime laws probably is to find people who are predisposed to commit them, stage an opportunity to commit a specific instance of it, and then apprehend them. So, yes, computer crime enforcement does have a "fishing for dumb people" element to it.
What would be really interesting in a thread like this is, after pointing out how US criminal law makes it hard to raise an entrapment defense, providing specific examples of how some other country's criminal law handles the same circumstances.