Art for art's sake.
This is not an argument in support of your thesis. It does nothing to counter Brin's thesis.
Artists are liers and can't be trusted.
And that's just a ridiculous untruth. Plenty of artists are honest, and plenty aren't, and plenty are somewhere in the middle. Nothing about art is intrinsically dishonest or untrustworthy. It's also a non sequitor that provides no counter to Brin's thesis.