Since Marxism never works, there's something definitely wrong with the tenets.

Are you familiar with the idea of a thought-terminating cliche [1]?

You have given yourself permission to ignore everything associated with Marxism because you've been taught that it's "wrong." If you actually thought about your statement, you'd realize that you are quasi-intentionally dismissing ideas without consideration.

1. What does it mean for Marxism to have been "tried"? Do you consider the Soviet Union to be Marxist? I don't.

2. Even if Marxism had been "tried" and failed, so what? Do we dismiss capitalism because of failed capitalist states?

3. Even if Marxism in practice was futile, does that mean that very idea espoused by Marx is necessarily wrong? No, it does not. Newtonian physics is "wrong" in light of relativistics but there is still very much right about it.

[1] https://en.wikipedia.org/wiki/Thought-terminating_clich%C3%A...