That's possible with a private company as the owner/CEO takes the blame and that goes as a part of profit/loss of some major stakeholder. Its a lot more harder

That's possible with a private company as the owner/CEO takes the blame and that goes as a part of profit/loss of some major stakeholder. Its a lot more harder to do it when tax payers are footing the bill. If you have, say, more than a few failures people would be complaining and asking for less iterations and more of one-time-done-well projects.