The statement "Democracy is only a dream: it should be put in the same category as Arcadia, Santa Claus, and Heaven" suggests that the speaker believes democracy, like Arcadia (a utopian ideal), Santa Claus (a fictional character), and Heaven (a religious concept), is an unrealistic aspiration or ideal that cannot be fully realized in the real world. It implies that the idea of democracy is an idealistic concept that may not be achievable in practice or may not exist at all.
