First, I think people are applying way too many Human moral values to the Mimbari.
Why is it wrong what Delenn did? Because in a Galactic, universal primal proton way it was? Because the universe is made of moralitytrons and she used too many anti-moralitytrons in her decision?
No.
It is the height of egocentricity to claim that another sentient race should adhere to OUR morality - we can't even bloody agree on our own morality amongst our own species.
Another thing is psychology - why should the mimbari think that gunports open is the wrong thing to do? Why should they use human traditions?
Dukat knew more about humanity than anyother Mimbari, he may have known their psychology was different and that was why he disagreed with the gun ports being open.
Can anyone honestly say if Air Force One was shot down because it was in restricted airspace/caused trouble that America WOULDN'T go to war?
Of course not - no matter the reason for AFO's activities, anyone that kills the president is evil and must be fought.
September 11 wasn't even an attack on America's government, and yet America went to war.
How can you possibly think that the Mimbari going to war was any less or more right than any other war instigated by any other people?
So list the facts:
The Grey Council was secretly outside Mimbari space (obviously not FAR outside Mimbari space, because the Human ships were supposed to be hanging around the border)
The Earth Captain moved in closer than he should have because he wanted medals
The mimbari saw him coming closer and scanned him (as any ship being approached by an unkown target will do)
They had their flags raised (ie their gunports open) - for all we know having your gun ports closed is a sign of agression amongst the mimbari.
Why is it that everything the mimbari did is considered stupid? Because poeple are applying HUMAN psychology and morals to them.
To the mimbari gun ports open is a GOOD thing, to us it is bad. Why is our way any more right than theirs? Why should we blame them for something that in their culture is fine, but in ours is not?
The mimbari weren't intruding on human territory, the humans were intruding on mimbari. Why should the humans' morality and values be those used in this situation?
What if mimbari doctrine is to 'roll over' on your back to show your belly when scanned by someone? They would have been just as confused when the humans didn't do THAT as the humans were when they opened their gun ports.
WWII - America and the allies perpetrated some amazing acts on their enemies - they didn't get tried for warcrimes. Why? They won.
The mimbari surrendered, but they had all the military power. Earth had a surrender in name only. Thus the mimbari won, and had absolutely no intentions of being subject to earth law.
Would anyone here want to be subject to Mimbari law?
The captain that instigated the encounter (because he DID instigate it) didn't even die in the battle - was HE put on war crimes for killing the leader of the Mimbari empire?
Did the mimbari push the matter? Did they demand he be sent to Mimbar for trial?
Hellebore