I think it's also important to understand that artists are also the beneficiary of shorter copyright periods. Art tends to be a little bit of creativity and a lot of remixing of expressions you're exposed to, particularly expressions in the same area of art. It's helpful to artists to have more rather than less expressions to reuse and transform, just like it's useful for a carpenter to have more than just a hammer.
A lot of the "extend it forever!" sentiment on copyright seems to come from a childish idea of creation where artists pull new expressions fully-formed from the void in a supreme act of creation, rather than by being built on the backs of old expressions.
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