What does that say about the state of America? As I noted in another comment, at least somewhat it probably says people aren't very conscious of the immensity of what a US civil war means. So that speaks to civics and educational issues, which are real and relevant.
But I would just say that in a society people's feelings matter, whether rational or irrational. Irrational feelings lead to real world outcomes all the time.
So even if you think that believing this outcome is likely in the next 5 years is extremely irrational, the fact that a significant proportion of the voting population could believe this has real-world implications.