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In other words, what evidence do we have that Newton's 3rd law is valid?
I would say that this scientific generalization is "supported by numerous experimental data."
The problem lies with the word "why." We do not know why. We just know, as
you point out, that this is one of the properties of forces in the universe.
We know how forces behave, not the reason they behave as they do.
The present does not seem to me to be an opportune time to enter
into the investigation of the cause of the acceleration of natural
motion, concerning which various philosophers have produced various
opinions .... Such fantasies, and others like them, would have to
be examined and resolved, with little gain. For the present, it
suffices .... to say that in equal times, equal additions of speed
are made.