The private sector generally doesn't like losing money.
If an enterprise has high risk, low reward, it generally will find it hard to get private investments.
In the real world, if a company doesnt make a profit, it folds.
The government is not subject to market pressures and can afford to spunk money away. Whether it's sending it abroad in "government aid" or building shit or hiring people that doesn't provide any value or profit.
The government doesn't have to be efficient. Private companies do.
You end up getting these government hired teachers complaining about their salaries, despite their huge pensions and long holidays ... when in the real world, if they were subject to market pressures, half of them wouldn't provide enough value to warrant their jobs.