A lot of groups seeking change establish the lines of conflict by constantly naming and accusing their enemies, and insisting on their essential evilness. This isn't great politics, but it's not usually a problem -- unless it moves to the next stage, where the group starts expressing a clear intention to eradicate those perceived enemies. This can be a signal that they've accepted the need for violent action in their own minds, and may be actively planning something. It's a shift that should never be ignored.
When Sean Hannity runs a poll asking whether his viewers prefer a military coup, secession, or armed rebellion -- and armed rebellion wins -- that's evidence of this kind of shift. Right-wing talkers have built careers out of demonizing liberals; but when they start talking about what specific steps should be taken against them, that's not something we should ignore.