Speaking of which, should Kirk and co. have tried to do more to preserve that last remaining survivor of the salt monster species instead of summarily wiping it out?
To what purpose? The species was dead. The possible culture had been lost. The Feds cloning a replacement species out of Nancy would be perverse - they would be creating an all-new species for personal gratification and absolutely nothing else.
The last vampire standing shouldn't enjoy additional special status as such. Interrogate it for ah so important knowledge if you must (but why would it have such knowledge?), but if it happens to forfeit its right to live, it being the last of the Mohicans shouldn't count as a mitigating factor.
Timo Saloniemi