The blame game is counter-productive whether its in an emotional or proffessional context.
What I mean is this in PR/Spin doctoring we learnt a major lesson which was: "See the problem, acknowledge the problem, deal with it or solve it and move on!" Do not attempt to justify but solve in any which way you can. And never try to blame anyone else unless you have 100% solid proof of their screw-up.
Remember every situation is a result of a 50%-50% series of events that lead up to said problem.