Teamkilling without any consequences

I recently encounter a player that have fun ruining the experiences of people in his team by making teamkill, and made them not reportable as he don’t fire to people but destruct their wings with his own as his plane have a stronger airframe. That mean, you are not considerer teamkilled, and you pay the repair cost on your own.
Is Is it a mechanic intended to allow teamkill without any suspicion ? If not, what are the consequences of doing it ?
Why the game doesn’t count the damage dealt to your plane by anyone and not only by the ennemies ?

If you want to discuss TK policy, please use this thread: