The short answer is an excellent understanding of human psychology leading to good marketing. Most criminals think they aren't doing something wrong. Most people can be trained to do very damaging (even evil) actions by acculturation and habituation. Americans have been re-educated in the past fifty years to think that all sorts of things are okay that they never would have thought when we were the industrial superpower that invented and produced everything imaginable (e.g. car, plane, tv, space shuttles, etc.). Of course, most of these changes in American thinking aren't politically correct to mention.
Nowadays people either go into finance or work on some little web startup in the hopes they will make a billion dollars -- but at least that is better than being a patent troll. The AirBnB scandal is in fact a great example of the present dynamic. It is a great service on top of existing infrastructure. That's basically all Americans do these days -- a service economy on top of actual products that are increasingly being produced elsewhere. Sometimes those services are good, sometimes not so good, but barely anyone actually builds anything that is made to last -- nor do they seem to care.
Wake up America!