Scientism is, first of all, an ideology, in the sense that claim, ‘a priori’, to be able to understand all of reality. The accusation is authoritative because it comes from the words of Mauro Ceruti, Professor of Philosophy of Science at the University IULM, Milan, one of the main exponents of the 'complex thinking' together with the philosopher and sociologist Edgar Morin. Scientism is, as claimed by John Dupré, philosopher of science, the truth about physical matter and about everything; believe, and the word is misused, that such evolution is unable to explain anything; claim to be able to apply a scientific idea of success far beyond its original domain, and usually with less and less success as the application is extended.
Like any ideology, scientism starts from a true ‘datum’, irrefutable, but partial, of reality: the existence of matter, the corporeal man. Hence it resulted also the totalitarian ideologies of the twentieth century.
The main accusation directed to scientism invests the ground of ethics: it argues that the scientific picture of the world leading to a desperate conception of life, in which values and what matters most to the full realization of a human being reduced to a contingent expression of subjective tastes, variable both in space and in time ("ethical relativism"). The fact is that if the assumptions of scientism were passed under the lens of philosophical analysis, there would arise an unexpected effect "deflationary ": the ball of scientism will deflate revealing for what it is, a rhetoric invention used for political or apologetic purposes.
Popper expressed strong criticism of constructivist rationalism that underpin scientism, seeing there the assumption of totalitarianism. Scientism, in fact, does not take into account that science does not proceed by induction, but it is always the result of human invention, and therefore should be reassessed in the critical role that it takes other forms of thought such as intuitive or metaphysical.
What is important is to emphasize that scientism starts from the same premise: having, by statute, to explain everything, it reduces the complexity of reality to what is less complex. Hence the foundation of scientism: man is only matter and genetics, can be studied exactly like a stone. Escapes the scientistic the fact that the only attempt to explain man, differentiates him from other forms of life and non-life, more easily understood. It was scientism that, generalizing theories, attributing them meanings philosophical, ideological or religious, using it to support systems thinking, converted legitimate axioms into arbitrary dogmatism and spread the illusion that scientific knowledge was the sole or supreme form of knowledge
In dogmatism and scientist misunderstanding fell or are still passing many subjects: philosophers, cultural operators, teachers, academics etc. Also much of the media simplifies and manipulates, with superficial incompetence, mere hypotheses and theories, making them sensational 'facts'.
These pseudo-cultural, arbitrary and unfounded manipulations, distort reality by giving real and universal content to terms purely conventional, processed for convenience of expression.
In conclusion there is to recognize that the scientific method is still the one that is the foundation of our knowledge.
Something has split scientism and led to the "crisis of science", or the confidence that these sciences may be that human progress leading to the resolution of the existential problems of man. Faith, this, and trust, understandable if we take into account the cultural context in which it is expressed. The positive sciences, strong as foundation of knowledge, collapsed as the basis of life, as constant progress and way to happiness.