No one can fight that kind of theory....
Looks unintelligent,stupid and boring but is self-contained.
External Cause is used to explain everything which is part of the system.
How and when that external cause came into existence is left for debate....
Therefore any good theroy must be self-referral...The cause and effect must be found within the same domain of expression.
However a horribly correct theroy which causes fear , anger and grief in me is not worth my attention.