Except the British soldier you've been "justifying" the death of was in his own country, no weapons, no armour, off-duty. For all we know he could have never even stepped foot in a "Muslim" country, let alone fire at anyone.
Still see nothing wrong?
Same can be said of Iraqis, Afghanis, Yemenis, Pakistanis, Palestinians, etc. Droping bombs on civilians, is not a way to make friends.
It doesn't matter where he is, or was, or what he has done. He works for the military. His actions supports the military. He helps kill innocent civilians directly or indirectly.
If I became a reporter for Hamas' media, am I a target? Yes.
If I am a scientist for Iran, working on nuclear program, am I a target? Yes.
If I am Osamas water bringer, am I a target? Yes. Regardless of never picking up a weapon, or a bomb, or anything. Just being a part of the wrong groupmakes one a target regardless of what the job description is. So really, don't be blind or a hypocrite.