I explain... It has nothing to do with "fairness"
SEAI, Battle of Japan... a desperate Zero takes a last measure he can and rams B-29 tail and dies or maybe bails
SEAII, Operation Barbarossa... a desperate I-16 rams Ju-88 tail and dies or may be bails
Bad situation, hard tactics unfair, but valid one. Currently you can't do it at SEA due to rear hemisphere modeling.
So two models:
- turning "all hemisphere" on would actually solve the problem at the screenshot above but can bring a situation that somebody rams me and stays intact
- turn kill them both even it is unfair - ok the life isn't fair

at least in SEA
Simple - that's it.