It's a good feature. In a pure sense, killshooter should be off for realistic play. It's off in many special events for instance. However, having it off in the MA would be horrible.
There was another fighter sim I once played that didn't have it and you had to constantly deal with "friendlies" shooting friendlies. Noobs who couldn't tell red from green or, even worse, the revenge guys. You'd kill someone on the other side and he'd switch sides and hunt you down. Many times the game was unplayable because of this. Given all the childish Ch200 griefers and whinners imagine what it would be like.