  dude, you don't think, "outcries of an artist" can be expressed, or as the matter of fact "outcries" of anyone in any other form than speech or sign? I think it is quite possible to express something or to tell something without using common forms of communication.
If you truly believe that that is not so, than human civilization has never existed. Art form , in abstraction, has been quite rich for human culture. Example? Well mona Lisa is quite hideous but its meaning and the sheer genius of drawing is , well.... powerful. And David, the statue, well dude, a naked male statue has never had so much importance and "inspiration" for so many.
I think what you are troubled by is contemporary art. It is quite "eccentric" and probably very "disturbing" . But I am sure, their truth or whatever it was the artist's intention will be revealed much to our awe, only quite later probably, much like the above mentioned masterpieces. I dont think Leonardo Da Vinci and Michaelangelo are laughing their asses off. are they? what do you think ? and i just named two. 
