I can’t believe there are players like this….I was shocked…..

Dakiras: Yep, it's not actually that uncommon but often it's not vocalised. I've watched some replays from the community and there are actually quite a few times I've seen the person whose replay I'm watching let a team-mate take a kill to help towards badges/achievements. It's great to see, but as Sgt Guffy says, they often stay quiet either because there isn't time to type, or because they don't feel the need to draw attention to what they're doing.