The essence of criticism is destruction. It is the destruction of what is, that should not be. If a statement exists as a lie, we try to destroy it from existent by pointing out the falseness of the statement or demonstrate against it. If a political system is bad for the human existence, we try to destroy the system by verbal or violent resistance. If a philosophical theory is not sufficient expressed, we participate in a theoretical discussion trying to expel the insufficient parts of the theory.
If this is correct, we should be able to improve existence by critical destruction. But sometime the criticism actual destroys an existence that is better then what it creates. Sometime the action of destruction is more destructive, then the existence it tries to destroy. And sometime, the critic points towards individual action and the criticism (both verbal and action) is so destructive that it destroys the man and even might kill.
Criticism combined with dynamic development is a dangerous cocktail. It is an aggressive attitude which might escalate into destruction towards optimalization. Human becomes aggressive towards their own body trying to develop it for perfection and aggressive towards external world trying to destroy it into perfection.