Olaris's main reason of hatred for the Special Forces is mostly like this. They kill like it's nothing to them, as if they made a complete sport out of it, and do not care who they strike down. Each person they killed, they have not had the same experience as he had by looking them in the eyes as they plead for help.
Olaris during the Lylat Wars knows the psychology from first hand experience. He was trapped in an area being heavily bombed and swarmed with enemy troops after being separated from his platoon when he was part of TACT, so he hid in a bomb crater for cover from shrapnel and other debris flying about. When a venomian soldier had stumbled into his crater, he quickly stabbed him twice in the chest but not fully killing him. Again he was trapped in the crater, so he had to watch and listen to the soldier weaze and cry out softly in pain as he slowly died. The fox couldn't bring himself to putting him out of his misery as the soldier begged for his life and quickly fell onto his knees, crying and cupping his ears to stop the noise to little avail. Eventually he brought himself to try and help the soldier with medical, only to watch the life fade from his eyes immediately after. Over the next few hours he read over his personal belongings realizing they could have easily been very close friends or brothers if they met under different conditions like a bar sharing drinks or a store. And the only reason they are even enemies was a uniform difference, and loyalty to men who will never meet each other in war.
And thats his story
, also the Telepath could have possibly picked that up.