The fact they weren't able to determine that from his actions prior to this is what makes Grim and Sagaar (and all the other glazers) so revolting. He is a gleeful mass murderer. He boasted about converting a grenade launcher into a makeshift mortar after they were ordered to stop using mortars due to excessive civilian casualties - literally just murdering civilians and acting like it makes him a badass. If that and all the other shit he got up to didn't disqualify him for you, then dropping him now isn't principled opposition, it's just fear for your own reputation. I think it's fair to say they were ride or die, it's just that he died. They have never had an ethical objection to the guy.