It's true that when they want to argue against "Democrats" (i.e., anyone who is not MAGA), they will insist we are a republic and not a democracy, because they are Republicans—otherwise they would be democrats, and that would be ridiculous. And yet, they still believe, and are mighty concerned, that democracy is at stake and that Joe Biden and the Democrat party must be destroyed to preserve it. See this, this, this, and this.
Yes, that is not consistent thinking, but they never were consistent thinkers, although they will argue that they are the only consistent thinkers, and that you and I are also not only not consistent thinkers, but are ourselves a grave threat to democracy. It doesn't make sense, and it doesn't have to, and yet they will insist it does make sense, and that we don't make sense.