First and foremost, there are no “facts” in science. The scientific method is developed in such a way that one can ever confirm anything, they can only disprove something. That is what allows us to keep looking, never avoiding at their understanding of the way the world works. That is why it’s the concept of severity and the concept of progress. A technically sound concept is falsifiable. So no, it is not the case that “hard” science has “facts” and psychology has theories; they all only have concepts. In every way, psychological science sticks to the scientific method as much as any other science. They stick to the same guidelines and strategies. They even evaluate psychological phenomena to the best of their capability.
They use calculations and analysis and even design individual actions in past analysis just like any other science. They test their concepts for reliability and credibility and they test the factors of their concepts. There is however 2 variations between their science and other sciences that have nothing to do with how they practice science, but rather what they study: They are a much more recent science and what they analysis is more complex. The first psychological lab was established by Wilhelm Wundt in 1879 and you can think about how basic the devices would have been back then. While this might seem like several decades ago, keep in mind that Galileo developed his first telescope in 1609. Imagine how much larger a leg up astronomy has had on psychology. Cognitive psychology was not a study subject until at the early 1950’s during the cognitive trend, but not formally until Ulric Neisser’s Intellectual Psychology guide was already released in 1967.
They have had approximately 50 years of studying individual cognition. The study of individual knowledge contains procedures relevant to: feeling, interest, knowing, studying and memory, language, intellect, problem-solving, decision-making. Imagine the scope of phenomena and actions all that contains. Can you appreciate what a short amount of time that is for such a complex study of topic? And that is just cognitive psychology. Psychology as a whole studies every part of the individual experience, such as social, child, character, neuro and abnormal psychology.