No they didn't violate any journalistic "ethics."
I saw the picture. Couldn't look away from it.
As a mother I grieve with his family.
As a journalist I want to the world to "see" the war as it really is, not sugar coated, so people can make-up their own minds.
As the wife of a solider I think its probably a good thing America doesn't forget what these guys are facing on a daily basis. When they come back and have issues mentally and physically, people need a frame of reference lest they forget.
Ultimately every horrible picture involves someone's family. Do we not show pictures of the holocaust because they are painful? Do we erase and white wash history because it hurts?
Pictures are worth more than a thousand words, and sometimes more than a million tears.
We're paying for this war, with money, with blood. Occasionally seeing pictures imo is a proper part of checks and balances.