Well, would you rather that nobody investigated when human remains are found in a wheel well? Or when multiple people plummet to their deaths after takeoff?

If civilians are killed, there should always be an investigation, that's part of how we (hopefully) ensure our morality in armed conflict. Whenever CIVCAS occurred from kinetics in Afghanistan, there was always an investigation, of which the casualty-causing aircrew were a part of. However, I never personally heard of anyone (in the USMC, at least) facing UCMJ charges from the unfortunate times that it occurred and the subsequent investigation. It's no different here, but people's hysterics and jumping to conclusions don't help anything.

If and when the aircrew is charged, then we can bring out the pitchforks. Until that point, save the moral outrage