The grief system: How can it be fixed?

[Peacemaker]

I think the grief system in the game is terrible. I hate getting 50 grief because some idiot ran infront of my tank. Or ran into a corridor I was firing down. Take your pick, the system needs to be improved.

I'd suggest no grief unless you kill a team mate, but that doesn't work. Then jackasses will shoot you down to barely any health with no consequences.

Let's hear some ideas!