> but private companies

Two things:

* The government is often in the situation where they want to fund some effort, like R&D. Say China is way ahead of the US in drone technology, and the US wants to catch up because that's a risk (we see how drones are used in the military now). So someone will have money to spend on US companies who will do everything they can to get as much money as possible. How can the government employee know which company is abusing? First they are all abusing, and second they are all failing already (otherwise the government wouldn't be in this situation where they need to fund them). This is a very hard problem.

* When it is about buying e.g. an IT solution for the company, I have seen private companies fail just as much as governments. McKinsey and their friends do the same bullshit to everybody, be it government or private companies. Don't think that private companies don't waste money. It's just that when it is the government, it is transparent and we like to complain about the government.