Marxism is a scientific approach.

Much of what we take for granted in science today remains fundamentally incomplete, yet it does not mean immense practical values cannot be derived from them. They are (imperfect) models that inform our understanding of reality. Newtonian physics break down at the sub-atomic level, yet it does not stop Humanity from inventing spacecrafts capable of landing on the Moon within meters of accuracy.

The proof is in the pudding: Marxism-Leninism remains the only strain of socialism that has achieved lasting success that resulted in the establishment of Actually Existing Socialist states, as flawed as they can be.

It is important to remember that no other form of socialist ideologies over the past two centuries have come even remotely close to replicating the success of Marxism-Leninism, most of which either never got off the ground, collapsed under the weight of their own contradictions, or were immediately crushed by bourgeois counter-revolutions.

The scientific approach of Marxism as such leads to potential solutions. You cannot defeat capitalism by telling people that “capitalism is bad”, just like you cannot possibly try to cure diseases by telling people “don’t get sick”.

Moralism can be useful but the actual solutions toward such emancipatory project can only come from a systematic understanding of how capitalism functions, where its weaknesses are at (the contradictions underlying the formation of capital) and how it can potentially be exploited. Marxism-Leninism, or scientific socialism, are tools that enable strategic planning and inform practice.

Similarly, the building of a socialist economy can only be feasible by understanding where capitalism has failed. Without which, the overthrow of capitalist regimes itself does not solve the actual economics problems and as such, will not lead to the emancipation of the human society.