If you can't see the evidence, it means you are not looking for it.
-Maoism of China
-USSR
-Venezuela
-North Korea
-Cuba
If you can provide examples of "capitalism gone wrong" that have led to more death, poverty, pain, and suffering than the countries I listed above, please feel free to enlighten me.
You said "long term government intervention". Some countries where we have long-term (100 years or more) government intervention in the markets:
United States
Great Britain
Switzerland
Sweden
Some more where we have intervention for as long as the current government has existed:
Germany
France
Belgium
Luxembourg
Now, feel free to show me a country where there is not long-term government intervention, and show me how successful it is.