When considering Dunning-Kruger or The Peter Principle many of us may fall in the trap of thinking they refer to the same thing, they aren’t. Dunning-Kruger is about self perception and The Peter Principle is about others (usually your bosses but as has been demonstrated it can include voters) promoting you above your capacity to do the job.
At work it may be frustrating to work with someone who may be an example of either but we learn to deal with it until we’re able to remove ourselves from the situation or the problem is removed. In politics things become more complicated.
In politics the boss or management may be the voters, so to whom does one complain? If you approach the voters and tell them they’re wrong they may become as defensive as a teenager defending their GF/BF from mom and dad’s attacks. So how do we rid ourselves without making them more loyal? In the short term history has taught us we can’t. It takes time. Time and exposure.
How long? Well in some cases (Steve King of Iowa) it takes years. In other cases it may occur after only one term(see Trump) but even then the loyalist may not accept the decision of the majority. In other cases it’ll be a mixed bag(see Marjorie Taylor Greene) with no clear outcome. Outcomes may be delayed because of limited options.
Trump’s gone from office but he’s problematic. Greene has been disciplined but is still here and is problematic. Both are grifting from their situations, but one has absolutely no shame and has shown it his entire life. One has shown a glimmer of being able to be shamed enough to demonstrate faux remorse, while at the same time tweeting taunts and threats.
Final outcomes? TBD.