The liberal worldview offers no solutions, only shame. "We" are responsible for climate change and the planet is dying and nothing can be done about it because the people's only option is to "vote." We can do nothing but feel bad about how bad everything is and how much of our own fault it is.
By contrast, the conservative/conspiracy theory worldview offers a cause and solution. They are causing this problem, so if we get rid of Them then we fix this problem. It's not that the narrative is simple (in fact a lot of conspiracy theories are extremely complex and dense) it's that it offers a solution and course of action, it gives people meaning and understanding (however false) in a complex world.
Our goal as leftists is to educate, we offer the same thing that the conservative viewpoint does, solutions and courses of action, except our solutions will actually fix the problem instead of attacking scapegoats and chasing shadows.