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Why specifically Kepler laws and not the other dozen ways in which our current understanding of physics could be incomplete?

Actually Dark Matter is just a way of saying there's something (not necessarily a "substance") we still don't know: the old metaphor of light for knowledge.

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I think we can increasingly say that it it almost certainly matter if some kind. I don’t think it’s a state of pure ignorance.

Darkness is not an absolute concept either. As an example, your comment is somewhat dark to me ("it it" and "if some kind") but not pitch black :)

Why is it that no one in astrophsyics seems to understand that electricity has mass?

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