> If the current copyright scheme does not promote the progress of science and useful arts, it is not performing as intended. All these copyright extensions do little to promote progress!

This is a strawman argument - the parent poster that you're replying to is defending copyright as a concept, while the one that they're replying to is attacking it - you're instead making an argument about specific lengths that hasn't come up yet, and nobody is defending.

Very few people (and I am not one of them) think that the "Mickey Mouse curve" style of copyright extension is genuinely useful to anyone except Disney, but holmesworcester is arguing that copyright should be abolished entirely, which contradicts the section of the Constitution that you quoted.