I don't understand why business project failures are treated like normal occurrences but government project failures are treated like fundamental and systemic problems with social democracy.
Because people have been conditioned over the past 40 years to believe the government is wasteful, and failures just strengthen those arguments.
Also, the government is generally lousy at PR, and people rarely understand how to connect the dots. The internet, (or specifically, world wide web), and google are good examples of things fostered initially by the government. Whether or not they might have happened without the government is debatable, but they did happen, and the government did help. The wins are far less visible than the failures.