There’s an interesting book “What is Wong with the World”, which points out that despite everyone agreeing that things are broken and people should unite to fix them, there are many competing visions for what “fixed” looks like, and this is been the source of much of the contention.
While I agree there is contention about "what's wrong", there's a bit of a difference between "I should put government money into my pocket" and "I think local district zoning laws need reform".
I believe OP is saying the most fundamental thing is people working in government acting moral and in the interest of the country, and not using the power position for self enrichment or engaging in petty corruption for social gain. If you have that then it doesn't matter if your system is capitalist or socialist or a bunch of competing variations where no one agrees. The outcome will always be severely hampered by their constant interference in business, plundering of tax money, and repression of dissent.
Most people probably universally agree on the topic of corruption, unlike economics or social policy. But it requires a well designed political system and a strong culture, which is difficult to do retroactively.
It was written in the early 1900s.