Do you feel the same way when someone bakes a cake, takes a walk, watches a sporting event, knits a sweater, or writes a poem?
The point of contention here is that someone of that level of intellect has "wasted" their talent on art, rather than productivity, which "should" come first.
For varying definitions of "should" and "wasted", of course.
P.S. Knitting a sweater takes forever too. Especially if it has buttons.
I don't know what could cause somebody to adopt such a twisted notion, but I think the roots of it go deeper than I care to know.