Sin Kill? You mean killing someone on your team as you kill an enemy? Intentionally fuck yes. Not intentionally probably not.
This is such a broad topic that has too many situations to account for. Melee Example... Did your team mate run into a room full of 10 enemies alone, hoping to melee them all...at the same time?? Is your team mate engaged with 3 guys in melee, is going down fast and is a shred away from downed state?? Have you seen your team mate play?? Do they have the situational awareness to not run in front of you while shooting?? And that's just melee. If I see any of the above situations I just keep shooting. If I'm a reaper, shooting into a enemy group and some lone retard goes charging head first into them, he's dead anyway, especially since he's literally runnin in front of me. It will teach him/her to learn to FLANK. Or think outside the box and rear attack. Honestly, there's usually more than one way for a melee class to engage enemy groups, and the best ways usually mean not a full frontal assault. For ranged it's way more trickier. I usually refrain from shooting unless there's a melee Player closing down and hitting them from behind or the flank, and they don't see them coming. I usually fire a few shots and hope they realize someone is there. but no. I don't ever Intentionally kill others.
