Why Art became Ugly

This writer has a theory and he makes some great points.
I read all the ism's and theories, I get it but I don't create with a thought about theories, truths, shocking , or making ugly images on purpose, etc.
Somebody on another blog made the statement
"Artists on the other hand think their plight is due to an uneducated public."
Maybe some do, but isn't that sort of buying into the theories