Answer

I explained this at length in my books. The principle of causality does indeed seem, at first glance, to come from our ways of thinking, but my claim is that this is cognition, not thought. True, we have not seen it with our eyes, but it is a correct description of reality itself. We have non-sensory tools with which to observe reality, what I called intuition. This is the meaning of Maimonides’ “eyes of the intellect” at the beginning of Guide for the Perplexed, and Rabbi HaNazir’s “auditory logic.” Both of these expressions combine a conceptual term with a cognitive term, to teach you that there is a part of our thinking that is really cognition, not pure thought. From that part emerges the principle of causality. It is a non-sensory observation of reality.
Therefore, people are mistaken in thinking (following David Hume) that this is subjective, our own invention. It is not.
Beyond that, even if it were an invention, if it was invented then apparently we need it (it makes it easier for us to think and to function in the world). We remain loyal to the teaching of our master, our teacher and rabbi, Prince Darwin of blessed and holy memory.