Facetious answer: Because as this article argues, what David Hume feels is just as important as what he thinks.
But seriously, I think the point is more that these things have been known (to some at least) for centuries, and David Hume is presented as one writer who articulated them. It’s still nice to have these things experimentally concerned, although I’ll be damned if the author of the article cited any sources, unfortunately.
Facetious answer: Because as this article argues, what David Hume feels is just as important as what he thinks.
But seriously, I think the point is more that these things have been known (to some at least) for centuries, and David Hume is presented as one writer who articulated them. It’s still nice to have these things experimentally concerned, although I’ll be damned if the author of the article cited any sources, unfortunately.