Bungie has never fixed the issue of players killing their own teammates.
To them it's a very low priority since they don't play their own games, and if they do...not enough.
Players can use titans and swords to kill their own fellow party members, by smashing them into walls, pushing them off cliffs and lunging them across the room to die.
It's an easy fix if you look at it.
When you're teammed up with other players you can no longer phase through them like you can when they are non party members.
All bungie has to do is keep it that way so players who grief can't kill their own party members anymore.
Boom
Done
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