Coming to the question about 'rationality'. You wouldn't call the theory of gravitation irrational, would you? After all, why the hell should two bodies attract each other just because they have mass and that too with the inverse square law? But it's something we've gotten used to.
Please provide some context to that. I have no idea why the theory of gravitation even came up!!
By the way, we got "used" to it because it's a law of nature, not something followed as a matter of convenience.