I feel like...I agree with this and disagree at the same time.
This probably holds true for MOST artists and MOST art, which is done with some kind of purpose in mind, even if there's no obvious moral.
But it completely ignores the idea of doing things for the hell of it. ^^;
Let's say I make a simple three panel comic: a blue pigeon sits on a branch. In the second panel, the pigeon is still blue, and still sitting on a branch. But in the third panel, surprise: the pigeon turns pink!
You could apply all sorts of meanings to this three panel comic, and honestly that'd make for a fun discussion. But it wouldn't change the fact that, surprise: I made the pigeon pink in the last panel just for the hell of it. I felt like changing the color. That's it. No moral, no message. I just thought it would be fun if the last panel had something different. Coulda been green. Coulda been yellow. I chose pink. ¯ \ _ (ツ) _ / ¯
The same goes for abstract art, and a lot of art that isn't abstract but just fun and random. I imagine myself doing a really bright and colorful piece featuring just an eyeball with a bright green iris on a yellow background.
"But why an eyeball with a GREEN iris, as opposed to a brown one?" "Why a disembodied eyeball?" "Why a YELLOW background?" You could ask all these questions and more, designed to get me to admit to some deeper motivation, but the only answer I can offer you is "'Cause I felt like it. It's pretty." I don't have any attachment to eyeballs or green eyeballs or any of those colors. It was just an idea.
This whole argument reminds me of my IB art class...honestly, when it comes to making museum style art that's supposed to impress people all on its own, I tend to want to do random things that I just "like". Maybe a sky, or a swirly pattern, or a red bunny wearing green glasses (true story). If I can't write a story about it, just let me do whatever pops into my head and it'll turn out better.
But all during that class I was pressured to find and apply deeper meanings, and act like an artist with a responsibility bigger than to just make things I "like". And I strongly believe that's why most of the art I created during that class was- pardon my French- hot garbage.
If you want meanings to art, feel free to apply as many as you want, but don't get the creator involved in what you believe should be seen in there. Sometimes a choice is just that, a choice. Not an ethical one, or a political one, but simply one. Not everything is so serious that it has to have a motivation.