This whole airport security thing is just a big facade. They did such a good job at scaring everyone a few years ago, that now people would refuse to fly if they didn't do something to make them feel more comfortable, so thus they have TSA with all their rules and regulations. Their purpose is nothing more than some fancy
PR. Anyone who wants to cause trouble and is even the slightest bit sophisticated can get around their security with ease. Printing fake boarding passes is just one of many ways.