The interlocking webs of policy which 'politics' seeks to knit are complicated. Whole books can be written on how two individual policies interact. PhDs in Economics are awarded for small snapshots of the whole cloth. Most people don't have the time to keep abreast of developments or read sufficient history to understand why some policies are bad. Thus, people use heuristics - rules of thumb - to make decisions about that which they aren't expert. "Is this person trustworthy" is a key issue, and we tend to overweight the opinion of those near us. "He is my brother, and I say he's ok" says a friend, you are more likely to believe a mutual friend, than the opinion of a stranger on the same issue.
In the evolutionary past, such a question was a matter of life and death. People only really had to trust those with whom they shared a close genetic relationship. Since the development of agriculture, we've been steadily widening that circle of trust. The wider you spread that circle of trust, the richer your society will be. Even before it had a name, Free market economics allowed people to become blacksmiths, knowing others have water, food, shelter and so forth covered in return. More specialisation, greater productivity, means greater wealth.
Eventually, this requires trust in people we've not met. Towns' food supplies require that farmers unknown and distant supply the basics of existence. Nowadays, It's unlikely the west could quickly supply all available plenty currently manufactured in China. Nor could China supply quickly the complex components and tools shipped from Japan, Europe and USA. Both China, and "the west" are richer from the exchange. And yet, we still don't trust "globalisation".
Most persistent fallacies in political economics are the result of simple policies that appeal to some base heuristics, but which when applied to the larger and wider society, fail catastrophically. Thus egalitarianism in one form or another pops up every 3 generations or so and succeeds in making everyone equal, but some more equal than others, and even more, dead. Then nationalism comes along, and says it's all [another, arbitrarily defined group of humans with slightly different modes of speech] fault, leading to more waste and piles of corpses. And even when the results aren't catastrophic, we seek out the views of those who agree with us on say, Nationalism to inform our opinion on, say, whether or not people are responsible for climate change.
Which political tribes stumble into being right or wrong on any given issue appears arbitrary, because no-one's asking for the evidence before they decide on the policy. Instead of asking "what's right", we're asking what's popular (amongst the coalition of tribes that voted for me) right now. That an opponent comes out with an identical policy, for different reasons is reason enough to oppose something, forgetting completely prior support for it. After all, whatever [another political tribe] thinks must be wrong, right.
The Labour party opposes ID cards. The Labour party has always opposed ID cards. The Tory party is for the Free market and was never in favour of the Corn Laws. We have always been at war with Eastasia. Perhaps if we could think for ourselves rather than just accepting tribal dogma, we'd get better governance. But none of us have the time. So "Democracy" is merely a means to give temporary permission to one coalition of tribes to push through dogmas over many issues, until either the population notices, or the coalition of tribes breaks up, and the electorate takes a punt on the other tribe's prejudices for a bit, and then gets on with whatever they were doing before.Remarkable to see Labour people oppose ID at polling stations when they wanted to introduce ID cards 10 years ago— Ben McCabe (@bernardmccabe) December 28, 2016
Society ultimately advances by eliminating prejudices it's acceptable to hold thus widening the circle of trust, and increasing riches. By falling back on ancient heuristics to answer the wrong question ("who's fault?" is the wrong question) 2016 democracy has delivered the worst political outcomes on a broad front, as a result of which, we are poorer, and more likely to start fighting as a result of the collapse in political trust we have seen over this year. The post Cold-War 'Belle Époque', which saw half of humanity, 3 billion people, lifted out of poverty, is over.