Labeling theorists view mental illness as a violation of normative values.

That statement is false
Labelling theorist tend to see mental illness is the result of self-fulfilling phropecy.
The labelling theorists based their assumption that people had the tendency to label/classify every body with a certain things. Some people, often label themselves as a failure, useless, or more important than they actually are that could lead to psychological disorders if they truly believe it.

Mental illness is not a violation. It is a condition that can be treated. The causes can be from social traits, past history and maybe the bad things that may have happened earlier in life.