1) I got 50 kills, and then BANG, newbie shot me down. Frustration. I was not trying to go to his cone of fire, just started turning when despite the order he opened fire at enemy which even were not in the range, and couple 30mm sent me to the tower. I do not care how much he is punished, I lost my month long kill steak!
2) I am flying and some friendly jumps ahead of me just in stream of my fire and die. He was bellow and under me, and though I gave vox message when started to fire, he still did it. I am court martualled, though it was not my fault at all. Frustration.
Analysis:
1 - can happen in real life
2 - can happen in real life
Solution:
1 - Watch over newbies. Train them. Educate them. Notify them that if they do it, they're going to court marshalled, before the mission starts, if you think that guy flying near you is really a newbie. (but on second thought, really real newbies will probably flunk the training rounds over and over again. They probably won't be able to join your flight anyway)
2 - Stay aware of where your frdlies are. Talk to them. Get your roles straight on who's attacking, who's covering, so dumb things like 3~4 planes hogging over 1 enemy, all firing over each other's shoulder don't happen. If some guy ignore your vox, and does something like that, he's bound to courtmarshall.
Let's try and think in the WW2 environment mindset, and we'll all soon realize, those things aren't any problem. If you shoot over someone's shoulder, or if some guy just jumps in front of you.. if he ignores your vox.. if someone doesn't know the word of 'cooperation'... it just means your flight is full of untrained, unqualified, and uncooperative rookies, whatever the personal skill level. Nothing more.
Actually, those situations seem only more real and immersive to me.

If I ever become a flight leader, and see someone like that, his evaluation will be zilch.