Quite the opposite. Everyone praises Karl Marx and Keynes, although they been proven wrong many times. Most Millenials think that Capitalism and freemarkets are evil, while Socialism is good. History has proven otherwise
Counter examples only show that something does not work in all cases. It isn't a proof that something doesn't work in any case. Supply and demand is going to hold true in the vast majority of cases despite the existence of counter examples. In a similar vein, you can't say that an economic model is invalid in all cases because there are counter examples.
There are a ton of external factors that lead to the success or failure of a market. Culture, politics, resources, and industrialization play a huge role in shaping the market. These things are ever changing. Argue against the model, not its success or failure.
That's the whole point. Markets are decentralized brains, while Socialism advocates that a government as a central planner will be more efficient (it could be more efficient in specific cases like total war or natural disasters) and lead to Communism where we won't even need a government because society will behave as one being.
The lesson of the pencil comes to mind: https://www.youtube.com/watch?v=R5Gppi-O3a8
South America rejected Keneysian policies for what they believed were more "free market" policies. They suffered greatly, and they did not experience the massive postwar growth the Western world and the Asian Keynesian countries (Japan, Taiwan, S Korea) experienced. This was a great tragedy, because south america should have done great as they were the only corner of the world not affected by WW2. But they remained mired in poverty.
It is difficult to prove an economist right or wrong because it is difficult to run experiments in macro economics. But as much as it is possible to prove an economist right, Keynes has been proven right.
“It’s not the size of the debt but its structure,” the hucksters insist.
tl;dr Print more money.
Furthermore, you probably do not remember this, but the Clinton administration was paying back the debt and had America on a path to being debt free. But Bill Clinton, scumbag as he was, wasn't stupid. The wars he started were very short and very cheap.
The rest is very Keynesian and it shows. I'm from South America, trust me. Saying that you're a libertarian here is taken as if saying you're a fascist. Guess who they blame for our own failures? Capitalism and imperialism, of course.
One can criticize the current system without implying socialism/communism is the way to go!! I believe the current system has many flaws and they can be reformed. All systems have flaws, and instead of throwing our hands up and saying "welp this is the best system we can do!" we can choose to shape the market when it is good for society.
The market exists to serve society, not the other way around. It is only a tool.
Speak for yourself.