As for the "point" of copyright, it is to give authors a temporary monopoly as incentive to create art that will eventually fall into the possession of all the People & enrich everybody.
It seems some in the US Congress and EU Parliament have forgotten that.
I'm not sure that's true outside of the US. Here that is the purpose ("to promote the progress of science and the useful arts"), but I think originally it was supposed to help by replacing previous stronger but more ad-hoc monopoly rights.
That page also has an interesting (anonymous) quote from when the first copyrights started to expire in 1735: "I see no reason for granting a further term now, which will not hold as well for granting it again and again, as often as the old ones expire... it will in effect be establishing a perpetual monopoly, a thing deservedly odious in the eye of the law; it will be a great cramp to trade, a discouragement to learning, no benefit to authors, but a general tax on the public; and all this only to increase the private gain of booksellers.".