Earlier quoted context omitted.
The original purpose was to incentivize creative works, and the desirability of that hasn't really gone away. For example, Free software would be a lot further along if there could be a lucrative business model behind it. Enforcement is just utterly at odds with physics and at this point, the idea of "owning" control of bits in someone else's possession is incompatible with a free society.
Actually, it was "to promote science and the useful arts". Not all creative works.
"The first copyright law was a censorship law. It was not about protecting the rights of authors, or encouraging them to produce new works. Authors' rights were in little danger in sixteenth-century England, and the recent arrival of the printing press (the world's first copying machine) was if anything energizing to writers. So energizing, in fact, that the English government grew concerned about too many works being produced, not too few. The new technology was making seditious reading material widely available for the first time, and the government urgently needed to control the flood of printed matter, censorship being as legitimate an administrative function then as building roads."