If I were David Miliband, I'd have made the same decision he has today. Not from any sense of pride, but for other reasons.
The way David was knifed in the back by his brother, particularly in the way Iraq was dredged up over and over by the Ed Miliband team to attack his brother David was a low tactic. Anyone who believes Ed miliband would have acted any differently from David had Ed been in parliament in 2003 is surely living on a different planet. For Ed Miliband too to decry the last government, a government he was a minister in and one in which his brother was a leading light, stunk too.
To rip off a quote made about MacMillan, "No greater love hath no man than this, than to lay down his brother for his own advancement"
Whilst I don't think it wrong that Ed stood against David, for Ed's team to attack David's decisions and record seems reprehensible.