As for the last objection - the typical voter's preference will be reflecting the political battles described above.
> People change their preference based on other people all the time. As long as it is clearly their preference, we have to assume that it's in their interest.
The problem is, it's not people changing their mind because they've heard someone reasonable saying something that makes sense. Politicians lie. Lie blatantly and lie on purpose. They hire the entire advertising machine, built out of professional liers and bullshiters, to convince people that their side of the debate is right by whatever means necessary. The average voter has to oppose people who are trained specialists in lying. I don't see how you could argue it's actually their preference.
But back to the primary reason. I could accept that start of affairs as fair, as long as we're dealing with things that don't matter much. But at this moment in time, we have several important problems - like supergerms, climate change and depletion of fossil fuels - that are going to destroy humanity in few decades, or at least pull us back into the medieval age. This shit matters. We need to make some hard choices and do some decisive actions soon if we want to have any kind of civilization surviving to the end of this century. And the democratic process is by design incapable of making those hard choices.
TL;DR: I don't want to "give power to the smarter" or a king or anything. I just want someone to actually do something about global warming and power issues before this stupid textbook-level coordination problem kills us all.
