Psychology is not an easy science. Like physics, it depends on reverse-engineering the rules to a complex system, but that system is the human mind, and unlike physics, which exists only at a single level, to understand the mind, we have to cross levels of abstraction, much like it would be utterly futile to try to understand a program by recording the patterns it activated on the silicon of a CPU. And worse, everybody thinks they're an expert, because everyone has N years of experience dealing with human minds. It's easy to think that any science should have a nice, clean, reductionist, petri-dish and blood-test approach. But the universe is under no obligation to make things easy. In a sense, psychology is the hardest science, because it is simply so difficult to cross these abstraction boundaries easily.