Maybe I should give a more concrete objection against the specific question posed by OP.
Causality, like existence itself, is not a derivative or restricted truth, but an axiom. Axioms are fundamental, primary, self-evident truths that are implicitly contained in all knowledge.
Axioms cannot be proved. And this is not a weakness or subjectivity. Axioms are better than proved, they are self-evident.
Causality does not need to be proved, it is directly perceived.
A demand to prove causality fails to grasp what proof is. "Proof" is an advanced, not a primary concept. Proofs depend on the prior concept of "causality" and on an immense body of other knowledge. Young children and savages have no concept of proof.
All ideas must be shown in order to be valid, but "validation" is a wider idea than "proof". Broadly, there are two forms of validation, proof and direct perception.
Proof is a process of inference, deductive or inductive. In either form, inference is a process of moving in thought from something known to something else logically related to it. An inference is made with causality in place, not without any. Consequently, there must be a starting point and an end point. Causality can be perceived directly and without inference.
Even Aristotle observed that it is illogical to posit that absolutely everything has to be proved. On the basic information on which all knowledge is based, proof is neither necessary nor possible, it is perceptual data. It's the secondary, not the primary means of validating ideas. The primary means is direct awareness.
And why does a proof prove? Proof establishes an idea by connecting it to the directly perceived, the self-evident. Demanding a proof of the self-evident is an absurd reversal.
cf. H. Binswanger, How We Know - Epistemology on an Objectivist Foundation, ch. 1