I hear you. (The difference obviously missed you.)
"The attractive force between two bodies is proportional to their masses and inversly proportional to the square of the distance between them" - That's the LAW of gravity.
Why? - That's the THEORY of gravity. And there's a Nobel Prize in it for you if you can come up with a better explanation than the current one.
Please continue my education. The law of evolution would be.....?
Actually, gravity is not understood at all!