Well if anyone can duplicate it, then is it really worth anything?

Why do you download music if it isn't worth anything to you? Of course it's worth something, whether you can duplicate it or not.

The copyright should only keep someone else from making money from it.

We do not allow people to take possessions if only for their personal use; it's wrong no matter how it's used.

it goes against the very thing this country was founded on - freedom.

Depends on what you mean by "freedom". We are not "free" to rape, steal, or do whatever we like. In fact we are "free" to compete on the basis of what we produce (capitalism) instead of who or what we swear allegiance to. What you want sounds like capitalism for physical products and communism for intellectual ones. I see that as being counterproductive and definitely NOT the very thing our country was founded on.