No. He is bad and he should feel bad. He was sad because his evil plans didn’t work out the way he had hoped. He is alone because he abuses the people around him because he considers himself a superior being for whom others are just play things.
His backstory of abuse goes a way to explain why he is the way he is, but it does not excuse it.
I cant speak to CoD specifically, but being able to locate opponents, shots, activity etc by sound is a massive advantage in many multiplayer shooters. I can personally vouch for its relevance in CS, Apex Legends, Arma 2&3, The Finals, DayZ, and Battlefield.
For your viewing pleasure I leave you with this Viva La Dirt League skit: https://youtu.be/sC8qtyGoGZw