Wow. That's the kind of discussion we should be having. I didn't quite realize that Pearl's causality cannot tell A->B->C from A<-B->C. On the other hand, no ot

Wow. That's the kind of discussion we should be having. I didn't quite realize that Pearl's causality cannot tell A->B->C from A<-B->C. On the other hand, no other non-experimental statistical technique can do that either. Also, many problems will likely have a very constrained set of causal graphs to choose from, like smoking/tar/cancer.