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Again, that is a beautiful explanation, and of course the focus on necessary and sufficient conditions is succinct and reliable.
However, I doubt very much that the questions "why are we here?" and "what was there before there was something?" will ever be vanquished from the human experience. That mystery, though it shall remain a mystery, is not unworthy of exploration or discourse. You choose not to entertain these questions and that's fine, but to suggest that they are not valid questions I think is incorrect.