1) The fact that there isn't any is one of the reasons for asking thatWhat does it matter if there is no accepted model of causality.....you've already earlier asked why the big bang even requires being caused?
2) Certain causal models allow for things to be caused that other causal models would hold to be uncaused.
Because it is existence.so pray tell why this is the only possible big bang in existence?
Sometimes it helps to have some basic familiarity with a field, theory, subject, topic, etc., before determining what confidence you have in claims about it.if I had very low confidence in the theory before, I now have none...