Then it is not actually altruistic. Nothing about communism really points towards the well-being of others, but towards its dogma. It claims to have the well-being of the “proletariat”, its imaginary superior class of humanity, in mind, but even who they identify as “proletariat” cannot live in a world without family, private property, religion and national borders.
They think it does.
The communist struggles, at the cost, often enough, of his own life, his own happiness, his own family, for the sake of the “workers”, or the mass of the people and their posterity, however defined.
The reality of it we criticize, but that was their creed. Overtly anyway, all human ideas are corrupted and compromised from the beginning.
Just like Satanists, they copied something else, and it is a very good argument that it was Christianity.
An old, very nerdy conservative slogan was “Don’t immanentize the eschaton”, that is, dont try to make heaven on earth. Because that was the root of the communist idea.