This is a surprisingly rational take that unfortunately gets completely derailed by history. Unfortunately, it's hasn't been the socialized countries in world history that have stopped at nothing to derail/destroy market economies, but the market economies that have through covert ops, open warfare, neocolonialism and economic isolation attempted to disrupt and dismantle nearly every nation exercising its right to self determination.It's my opinion(so take it for what you will) that your view of greed is far too simplistic, along with many peoples views of similar topics.
I'm on shift right now so don't have time to go into depth on a topic but can highlight a couple things.
Think to yourself how a government is going to remove greed. Are they going to take control of business to remove the motive of profit? Power takes over in that scenario. Power to control people, power to manipulate external markets, etc. Removing greed from business. There's one I believe many are confused on. It's pretty difficult to think of a monopoly that has ever existed without the aide of government. Competition is driven by greed, either for control of market share or quality of product or many other reasons. Large business loves large government as they can regulate away competition. Large business can absorb these costs while small business will struggle.
Each one of those examples can be a full blown debate & entire courses or even careers can be had discussing them. Many people tend to take the easy route in believing that some government entity or body can make their lives great by making their decisions for them. The US and many parts of the west are starting to move this direction. To cut this short, so I can get back to work, I offer the following as a simplified solution. Since we as humans are all very different in our beliefs & experiences, why not setup countries across the globe with varying forms of government from socialist to fascist to libertarian. Instead of people attempting to change a countries politics, move to the one that aligns with your beliefs. If you are a driven free market type who values personal liberty, move to the libertarian country. If you're a devout socialist, move to the socialist country. Making international relocation simplified should aide this experiment. The big downfall with this idea is jealousy. Once people start seeing the material things free market people will have they will become jealous & attempt to bring them down instead of enjoying the social programs they receive. Also, 2nd & 3rd generation family members may not agree with their parents/grandparents point of view & decisions. Families separating due to ideals is a difficult thing. It's a flawed idea but one that just came to mind while typing.
Anyway, back to work.
See Chile, Peru, El Salvador, Cuba, Angola, Vietnam, Guatemala, Panama, Grenada, and the list goes on. In most cases, wealthy elites in these countries conspired with their foreign counterparts to maintain their regime or get financial and military aid to bolster a market system. This has been the real conspiracy and it's plainly written down in hundreds if not thousands of books, but due to widespread illiteracy and propagandizing, many prefer rehashed distillations of whatever they grew up being told via YouTube videos.