I have made my position clear and given the morality interrogation more of an answer than necessary. My only response to your objection, whatever it is, is to emphasize the key point once again:

No, this isn't a time to signal a naive morality to idealistic lesswrong members. It is a time to shut up, multiply and protect. This Wedrifid is a vampire, he has what it takes.

You can call vampire!Wedrifid whatever names you like, evil, whatever. Just don't get in his way with the yabbering about the moral value of the enemy. The moral value has been considered. It will be very sad to lose them. Maybe he'd cry later if he was into that sort of thing. But he's done the multiplication and there was a factor of a heck of a lot more than 2 to spare. It would be a shame if someone interfered and wedvamp had to shed another tear for them once he was done with business.