I see what you’re saying in terms of idealism/naivete vs pragmatism. However I also get the sense that what you mean by government and politics is a bit different from what the left usually means. I’d be interested to understand what you mean by “politics” and “government”.
A couple follow-up questions that might help clarify the distinctions
does a society make choices between better and worse practice of politics/government?
what would a world that doesn’t need government look like if you were to imagine it?
The only part is disagree with is that the left encourages not participating in politics. I’m pretty sure a pillar of the left is encouraging informed participation in politics. Unless you mean punk/commie ideas of rejecting the establishment in favour of revolution? That’s still participation in politics.