Everybody does something for a different reason.
I might as well start of the discussion, I want communism for a few simple reasons.
Capitalism is extremely bad at organization, especially within the workplace. I want to be free in my methods of labor and labor because I want to, not because it is forced on me.
I want to end the massive military industrial complex and focus on science and progress.
Life is boring, without dedicating it to something you think is useful why live?