Yes. "Hard" sciences aren't as perfectly objective like TV would have one believe. Plenty of hard sciences are affected by the replication crisis, like geology and astronomy where one can't set up controlled experiments, same as soft sciences. All of them should strive to develop the best model, break the model, improve the model, repeat.
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The study of human behavior is more difficult to measure, but can absolutely be held to scientific rigor. In fact, all branches of science have some degree of overlap and interconnection, and thus have blurrier lines than you might expect.
There are lots of scientific groups that work in the so called soft sciences that apply the usual methods of the hard sciences. It's not about soft or hard, it's about good or bad.
Sure, but economics itself can be studied scientifically.
No.
Unless it can be imperically proven beyond reasonable doubt in order to remove human bias, say, like politics, et al. Otherwise it is glorified opinion. A lot of soft science is so-called science by committee.
Hard science already has an existing problem of soft science think-creep as it is.
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