If I may be so bold as to inject my professional opinion, on Bashir's action, and it's "morality", or lack thereof:
"Just to be sure" begs for the question, "Just to be sure of
what?"
In his case--I'd wager he doesn't know whether the guard had been aware of him or Sarina before his losing consciousness.
Does that make it "right"? To be perfectly blunt, I
really think that's asking the wrong question.
As far as I'm concerned, there
is no such thing as "war atrocities". War
itself is the atrocity. It's an ugly, hideous thing--but when you have to fight it,
you have to do what is necessary to win, and to win it
as quickly as possible, so as to
end said atrocity as quickly as possible.
To call what he did a "war crime", and akin to "torture", is missing the point. Had the guard been allowed to live, and had he been aware of Bashir and Sarina, he would have given that information to his superiors--and the result would have been a diplomatic incident--
which it was the entire point of the mission to avoid.
An ugly, hideous action? Perhaps. It's called war. And in war, ugly things have to be done, to avoid a greater "atrocity" in the future.
"But,
Rush! But
Rush! That makes us no better than the other side--"
What of it? That's not the point. The point is to
win. Once the conflict is over,
then you can worry about showing everyone that you're "better".
I'm sure Kira could tell horror stories of what the Resistance had had to do, "Just in case." But as she lectured Damar and Co., the point is victory--achieving what you're fighting to achieve. Everything else is secondary.
NOW--
That being said, I personally would have preferred more of an acknowledgment from Julian, on what he would (as far as he was concerned) have to do, and how ugly and incomprehensible the deed would be. A moment of deep regret, before he pulls the trigger on the guard.
How would
I have written it? Probably with his staring at the unconscious guard, reflecting on the fact that he can't be sure of what the poor soul knows, or doesn't. He finds himself raising his weapon--
He freezes in shock, at first finding himself unable to do it. He reflects on his Oath as a doctor....
But then, he remembers something Garak told him, in "Our Man Bashir":
Garak: That's something else you've yet to learn, Doctor. A real intelligence agent has no ego--no conscience--no remorse...only a sense of professionalism!
And, forcing down the intense pangs of his conscience and his remorse--he shoots.