Is there a philosophical position for and against the idea that every causal entity can in principle contribute to every effect?
So do some e.g. physical explanations claim that entities of type X can make no difference to what happens, cannot figure in the explanation, perhaps because of their size or location?
An example of a "why" question hat limits its own scope could be ones that ask about moral responsibility. Many people would say that these should hold independent of e.g. gender, and the fact that I'm male gives me no more rights or responsibilities toward your property. Is there something similar for physical explanations?