Perhaps the Millers will learn their lesson on political terror when ICE comes knocking on their door. Traditionally, the goddamned Nazis end up stabbing each other in the back sooner or later—see "The Night of the Long Knives".
They are therefore by no means only a threat to their opponents.
Looks like Taylor Greene will probably be one of the first to be dealt with, but of course, no one is safe from narcissistic psychopaths without a conscience. So, like anyone else, it could happen to the Millers at any time.
It wouldn't surprise me or make me sad in any way—quite the contrary.