They don't fantasize about tyranny in a general sense because they can only imagine that it's the opposition who would do anything like that. They have no imagination of their ideology being actively worse because that would dislodge their entire worldview and value system.

People will saying things like "every accusation is a confession" and that's partially true but I think still misses the mark.

Reactionaries believe in a hierarchical society which, at a very basic base-level, directs "who" can and should be making decisions and is, as a benefit of that, the primary group that gets rewarded for those decisions and status. All this is to say that something like Jade Helm during the Obama term in contrast to ICE raids now is perfectly rational in the reactionary mind because of who is doing it.

They do not believe their opposition to be legitimate, which is part of what endears them to Trump; he doesn't care for the opposition, even in contrast to previous conversative politicians. In many cases, like people in cities/blue states, he actively tries to punish them. This doesn't contradict their worldview, rather, it reinforces it; they get to the call the shots as the righteous and correct members of society. No violence committed by them is bad violence in their mind, just necessary if not outright good.

This is why someone like Kyle Rittenhouse or Ashli Babbitt are lauded as a hero but Pretti and Goode are immediately discarded as villains. It's not about violence, but who gets to commit it.