I'm not sure that people haven't, but I think they run into more variation in people than they do in electrons. I don't remember any discussion about any emotion on any relationship mailing list that hasn't included at least one "YMMV". I think this makes strict laws more difficult to find, although still perhaps quite real, practical, etc.

Maybe it just means we need to look at a deeper level for such laws. We found a heckuva lot of variation in, say, various physical substances, before figuring out the atomic and subatomic particles.

I'm with you on this, although I find there's often an element of this in real science.

True enough. And there are good reasons for it at times, too. I'm just ticked at Freud because of how he screwed over multiple generations by pushing his made-up, harmful stuff.