As the lore dev responsible for outlining NT corruption, I gotta' say, this would totally go down as a "Vigilant commander of security force single-handedly eliminates a Tajaran terrorist and murderer of three" kinda' thing.
NanoTrasen is unsubtle enough to have loyalty implants be a thing. I think if the commander had straight up killed the tajaran out of nowhere at the start of the round this would obviously be as irrefutably malicious as you say, but under these circumstances, and with such little news getting out from the other side during these processes of law ICly, any actions taken against this commander would probably be dropped by a higher ranking official to keep the news out, and any reports that did finally go out would be heavily edited by Biesel's corrupt news teams.
Chaz maybe should have acted with a little more consideration towards the law part of things, but.. I can't say I blame him or his character for getting pushed over the edge.
EDIT: Some people might get the wrong idea from this; heads of staff are not invincible, but they do sometimes hold a different leverage on a few things, hence needing a whitelist to play them.