Elected officials have at least some accountability to the voters. If they do anything sufficiently bad then they don't get reelectedIf I say "pay me 50 dollars, and I will give you X", and then you pay me and I just grin at you, and the WORST you can do to me is to say "fine, then we won't do that again", that's not accountability.
The only thing preventing that would be their own consciences, which may work once or twice but is guaranteed not to work forever.
Their own consciences AND each other. "Each other" meaning a heterogenous group of people from all walks of life, instead of mostly their buddies and "the people doing the same stuff for a different team", which is so much weaker a check. Ever been where thousands or ten thousands of people are? No cameras, no cops? At least where I am those tend to be peaceful and rather moral on average. Small groups of friends however, they can be real dicks. Split them up and mix them with people they don't know that well, or at all, and they will behave much better. Such is the nature of criminal conspiracy, it doesn't like randomness and shooting from the hip.
Don't ask me about the specific implementation details, but I think there should be more "actual accountability", and I don't see why that wouldn't be applicable to "random politicians" as well. For starters, if everybody could theoretically get "drafted" for this tomorrow, many people would make it much more of their business to pay attention to what is going on, to what others are doing in that capacity. That in itself could have a positive effect.
And maybe it could start small, with a few hundred random people who have somewhat of an influence. And if that goes well, do more of that. A/B testing, you know? Because if we're just doing Gedankenexperimente, I don't see why how I experienced the world so far, namely that people in general are good even when they might be a bit lame, and people who want power are usually compensating and sport at best some kind of genius of mediocrity, shouldn't win over your concerns.