i do because thats what some players care about causing teams to lose
What? Sorry how is the KD factor causing players to lose?
OP said it's causing teams to lose. If you're on a team where players to concerned with keeping their K/D up instead of trying to win, it could really affect the outcome of the game for your team if you get players who dont go for objectives and really help the team win.
They should keep KDR for TDM and other modes where killing only is the prime objective. Kill Confirmed is more about tags being collected so I would take the KDR out of that mode along with Capture the flag, Domination and yea, you get the idea.
Keep KDR for Party games though.