Hey, we're giving your ideas serious discussion.

By your standards, we don't have a "good explanation" for gravity, electricity, formal logic or indeed anything at all. However deep we go, you can always point your finger and say nyah nyah, you haven't "explained" this base level! But your request would be hard to satisfy: pray tell, what conclusion could possibly follow from no premises at all? What concept is so obvious that it could be explained to an "ideal philosophy student of perfect emptiness"? None! So you're forcing us into bottomless recursive descent instead of, you know, building more precise models and actually predicting stuff.

The sciences do not try to explain, they hardly even try to interpret, they mainly make models. By a model is meant a mathematical construct which, with the addition of certain verbal interpretations, describes observed phenomena. The justification of such a mathematical construct is solely and precisely that it is expected to work. - John Von Neumann

If you want a mathematical model of causality, read the links to Judea Pearl. But if you want a "philosophical explanation", sorry, I can't help you here and I doubt that anyone can.