That was never your problem to deal with, but you sucked it up and took pity on that poor cat. I know it's grateful now, even if it didn't understand how merciful you were being at the time. If its breathing was so labored, and it was bleeding from the mouth and having all that trouble breathing, it was only a matter of time though it would have been an AWFUL time, before the cat died. Thank you for letting it go one to its next incarnation.
If I were your mother, you would NOT be returning to work with those barbarians. If they care so little for any life, I certainly wouldn't want you to be around them for any length of time, for fear they would desensitize you.
You were the brave one and the responsible one, the rest were cowards and irresponsible.