I never claimed to be a master of psychology? That's another assumption you've made. Oh statistcs is the most deceptive tool in use today. They can be manipulated to no end to suit results. Also, stats just makes correlations and never gives a causation, that's the qualitative stuff that I've been talking about. Basing theories solely on statistics is what makes the social sciences shaky.
Social science studies has so many variables, it makes it hard to do a research and make accurate predictions about future behaviour or events.
You know who has that same problem? Metrology. You know what they do? They use chaos theory which a highly advanced mathematical method of finding order in disorder. The maths is so complex it cannot be done by hand and it needs to be done by computer.
When the social sciences start using rigorous methods for making predictions about their theories only then it can be considered in league with the natural sciences. As of now, it's akin to the little sister of natural science struggling in school to understand maths.