At first, bare with me, really! I am a scientist and engineer and this is by all means not a right winged statement at all, just listen or rather read on :)
Lets start with the common IQ scale. What does it tell me? It's designed so that 100 is the average value and 50% of the people are either more or less above or under 100 points. Where would you commonly meet people with an IQ above 100? I would say universities or science centers. Now i am currently studying at a university for my Master of science (Mechanical engineering) and i meet a lot of students that way and i see their abilities to solve problems that occur in almost everyones life. Problems like my laptop is not working, my phone does weird things, i have no time for this and that. Many of the students are not able to fix the laptop or phone problems once and for all because their inability to understand a complex problem. In many cases a lot of complex problems are outsourced to people with the knowlege to fix them. Which is not a bad thing, everyone does it and our world wouldn't function without it. The problem is that with a lack of unterstanding the problem many decisions are not thought through.
Now here comes the main point: If university students, scientists and researchers, which are more intelligent than the rest of the people sometimes have problems to understand a complex yet common problem, what about people with a IQ which is below 100? My theory, based on experience, is that those people are even less able to understand the problem or even see the problem. They don't see the big picture, they don't see the context, therefore they can't base decisions on it.
What does this have to do with democracy? We get there in a bit, let me define problems first. Today and for a foreseeable future one of this big complex problems is environment. How do we make the change from fossile energy to renewable energie? How do we make the change from eating so much meat, to eating less? How do we restore the ocean after raping it for decades? Another one is the tension in todays society. Right now we steer towards a society in which the rich get more an more and the majority of people don't know how to handle a surprising expense above 350 euros. That is the western world, you can imagine how bad it is elsewhere. How do we change that? How do we feed the million people in africa?
All af there problems are very very complex and yet we have to align our politics to solve them. So politic is made by people who have been in their party for decades and often these people studies law or some other degree that disqualify them from understanding these scientific problems. Therefore they need consultants which elaborate the problem to them. What happens here is that the problem is simplified and the consultants (often also lobbyists) put in their own intentions. The next step is that the politicions want to get elected and therefore they simplify the problem even more cause they want to reach every person no matter how intelligent they are. In every step the bigger picture gets more and more blurry and at the end you can't tell how it looks like, also many (about 50% based on the IQ scale) can't work out the bigger picture for themselfs.
Now here is the problem with democracy: Everyone above a certain age is eligible to vote but as we explored above hardly 50% of the voters get the bigger picture. I would say just 20% are able to get a sense of the problems and see the bigger picture and there is hardly any politician under them. So many people base their vote on bullshit politicions say to get votes and not on the bigger picture. The problem with democracy really is that everyone can vote but most of the people are too dump to even see what's important. Therefore we get a lot of bullshit decisions and now consequent work on the real problem.
I bet you want to hear a solution right? You won't like it because it has a bad taste. My solution would be a dictatorship of scientists, so of intelligent people who see what's important. There would be parameters that define the wellbeing of people and in the longrun these parameters have to be met but they can be violated to achive what is needed. Of course there has to be free press and all but the direction a country or the world goes can't be decided by the big dump part of the worlds population cause dump people make dump decisions and that won't get us anywhere.
Yes, this is radical and i am open for discussion because this is just scratching on the surface ;)