Ethical implications & critical thinking...

Affirmative Arguments

However, there are also significant reasons why a critique may be necessary or desirable in particular situations.
Diagnosis and error correction: critiques identify the limitations of the object of criticism. A film critic, for example, might discuss the extent to which a particular film was able to communicate a theme. Criticisms also identify prejudices, biases, and hidden assumptions.
Improvement: by evaluating the ability of an individual, action, or idea to accomplish a given objective, critiques identify possible improvement areas. Criticisms may also present alternative perspectives or suggestions, both of which facilitate improvement.
Ethical implications: critiques of societal norms or public policies have the potential to effect a large number of people in a profound way and are thus ethically desirable.

http://en.wikipedia.org/wiki/Criticism