To separate this form of socialism from the other kinds, it should be referred to as scientific socialism. The 19th century was the age of science and there was not a single field which science did not affect. This development also had an impact on the social sciences as well. Socialism, therefore, is an expression of social sciences. That's why it should be called scientific socialism, or, in other words, that's why socialism is scientific.
Socialism considers itself to be the most scientific ideology ever.
There are several reasons for this, the main reason being that it is closely linked to the working class. The ruling classes are forced to lie and to distort reality, but the working class has to be realistic, that is, scientific. The working class has no reason to lie so as to exploit people. That's why the working class has an inclination towards science. People naturally seek Utopias.