Yes the killed journalists were in a country that was being attacked by a foreign nation. This does not make it their fault that they were murdered.
While this might be a common occurrence in war, it does not excuse anything: if wars are fought in a way that these kill innocent people then they should not be fought in the first place. Something is not morally excusable only because it is expected when done.
Thirdly, sure the crew was investigated (here i admittedly only know what wiki has to offer) but there is no known outcome of said internal investigation.