You are forgetting some very important facts.
1) the candidates presented in the primary elections are already pre-screened by their respective parties. The voters DO NOT GET TO CHOOSE THEM.
2) even with the above, that does not absolve the politicians from presumably knowing better, but still engaging in the alarmism and power grab.
In regard to the reference to godwin, that rule relates to nazis. The stazi was a secret police force tasked with monitoring the activities and lives of the citizens of east germany, most heavily concentrated in east berlin. For all intents and purposes, they were above the law, and have very profound historical parallels with our current NSA and TSA operations, especially in regard to their involvement with secret courts, and secret verdicts/punishments. The comparison is apt. They just aren't nazis.
Look, I simply don't argue with anyone mentioning the Stazi, simply because the level of impunity is a order of magnitude's difference. But I refuse to continue on that subject, and will ignore any further comments.
And as for, pre-screening, are you aware of the primary system? Anyone can join these, and I'm aware of a random person in Connecticut that ran fro Office in Ohio in the democratic primary, he was frontrunner until someone else (someone from Ohio) joined the race. If you can make yourself known, you are golden. Are you aware of the numerous third-party candidates who haunt the place below "Democrat, Republican"? It's because no one cares. And guess what? When they do bad things, if people disagreed, they would vote them out. Or rather, they wouldn't fall for it, because presumably the purpose of Democracy is to make sure someone can't get away with violating your interests. No one, cares. And guess what? In the age of the internet, there is no excuse for not caring. If you don't care, you don't care, and nothing on this earth will change that. Not caring is tacit approval. There are people you can vote for, as long as you can get the petition, anyone can run.
And finally, you're just moving the goal-posts with that. I can do that too. If the people really wanted change they'd vote a write-in. Or one of ignored thrid party candidates, or hell just a different person in the Primary, but wait: You assume that everyone in each party is the same, and that both parties are essentially the same, so not even that counts.. You have to explain how establishment republicans are trounced by tea-party upstarts who then lose to democrats. E\xplain how everything in Congress, all the debates, all the personal animosities, all the "red-state democrats" and the "Blue-state republicans", all the defections from the party line, how all this is a elaborate scheme for power. Explain to me pre-approval while simultaneously knowing the
Head of Senate Republicans faces a strong Primary challenge from the right.
You need to realize, Democracy at it's best has some serious flaws, and Democracy's best this is not.