Where human beings are concerned, there will always be problems. Somebody somewhere manages to get into a position where they will abuse their authority. When you consider the millions of people who pass through TSA screenings, the number of reported incidents is significantly low. Another factor is airports. Some TSA departments may have weaker management at some locations, resulting in some personnel who may be less efficient and proper than others. But again, it has to be a minority of locations due to the number of people who travel. If a majority of TSA departments harassed passengers, there would be a far greater outcry.