[Comevius]

Even chemistry is less rigorous than physics, for the same reason biology is less rigorous than chemistry, and so on. Social sciences don't have to be quantifiable, or completely reproducible to be useful, in fact they usually can't be because there are too many moving parts involved. Psychology already provided many important explanations, even if there is a lot of bullshit that will take centuries to weed out, given the complexity involved. The bullshit is part of the process.