He also has a duty to obey the laws of the United States, and there was some question as to what happened.
Spurious investigations after the fact do nothing but destroy morale.
Define "spurious." There were questions raised by persons within the unit. If they aren't dealt with, then various people will get various ideas--and none of those ideas is a good one to let fester. (Either some will say, "Hey, I have a green light to be a thug," or some will say, "S**t, the CO gets the elevator, and I'm gonna get the shaft.")
Commanders will become timid, not wanting to be second guessed at an Art. 32 hearing, and will start vetting every decision with the JAG and thus lose the initiative.
If commanders actually do become that timid because someone might review their conduct, then they are completely worthless anyway.
Stop this madness with the lawyers and warfighting before every active duty soldier quits in disgust.
If they cannot be bothered to have their judgement questioned in questionable situations, then I don't WANT those soldiers on active duty.
The righteous do not fear having their actions examined.
If members of the unit raised questions, you're right, but that's not clear to me from the article. UPI only mentions interviewing unit members, not accusations. The press could easily have been put off by nothing more that the name "Midtown Massacre", pressuring the Army into the inquiry. If the investigation was completed last May, it's a shame they had to leave the LtCol hanging for eight months.