Why does copyright law not give the owners complete control of their works?

Because the owner can't control people sharing it.

Explanation:

I believe the reason why copyright law doesn't give the the owners complete and utter control of their works is because the owner can't really control their works being shared among friends or showed over different sites.

the answer is counterpoint.

counterpoint definition: "the art or technique of playing a melody or melodies in conjunction with another, according to fixed rules."

counterpoint is present in a lot of baroque music- such as bach (notably his wtc prelude and fugues) and scarlatti, but can also be found in music by mozart, beethoven. it can even be found in music as modern as john williams!