Why is it okay to kill people in some cases but not others?

[ern]

Suppose there are 2 men I just make up off the top of my head. Both are pilots.

The first man is in the military. He pilots a military aircraft. He gets an order to bomb a building full of people. The pilot drops some bombs, and as people are going to run away from the carnage he drops a few more. He kills 59 people in this little bombing. including some child laborers who are workers in this factory. The factory was suspected of producing something for war, but only suspected. He kills those 59 people, he goes home they call him a hero they give him a medal. Not one of those people personally did anything to wrong that pilot. He never looked a single one of those 59 people in the eye.

The second man is a civilian pilot. He is a married man. Because of his job he needs to travel a lot. His wife gets bored with her man not being around so she decides to have an affair. Well her husbands flight got cancelled b/c of the weather or something like that so he goes home early. He finds his wife in bed with another guy. He pulls grabs the man off his wife and gets in a fight dropping the man on his head breaking his neck. That guy was porking his wife and did him wrong. This guy don't get treated like a hero. This guy gets treated like a criminal and does some hard time for murder.

The 1st guy kills a bunch of people who did him no wrong and is treated like a hero.
The 2nd guy kills one person who did him a big wrong and is treated like a criminal.

That's the world we live in. Most laws don't even really make logical sense.

An 18 year old can get a license to kill in the military, but still not allowed to go have a drink at the bar. We live in a seriously messed up world.