Much of modern art I wouldn't want to understand. I've read how some of these pieces are representations of the painter's deep subconscious. Boy, I wouldn't want to even try to understand that subconscious.
If you subscribe to the concept that truth is understandable (which I do), then artwork that can be understood aligns more with truth? Boy, I might get attacked for that foray.
And, from another angle, assuming the artist has something to communicate and that art is a form of communication, why would an artist want to communicate something that no one can understand? Unless they're the type of person that just likes to hear themselves talk or that they like confusing people.
I'll never forget when I was 17 walking in downtown St. Louis and for the first time saw a new modern sculpture that had just been installed outside a building. My immediate reaction was revulsion and then I felt indignant that someone would insult my intelligence with such a thing and call it art. I had pretty strong feelings against modern art from the moment I saw it before I ever heard anyone try to "sell" it as good and worthwhile.
All that said, I can enjoy some art that is abstract, but not contorted and supposed to be laden with some deep psychological meaning.