Well, I'll throw this in.
For a start, Berserker is killing in a combat situation and although it is hard to quantify, there IS a moral difference between killing in a fight against people that are trying to kill you, and between the mass and cold blooded genocide of a vast, almost unimaginable number of people in roder so that you can then inflict a similar genocide on another set of people.
Also consider that you would be slaughtering a. non-combatants and b. all the minds that could have been freed.
Not necessarily making a judgment here, but I have great sympathy for people that lay down a difference between the killing they are more or less forced to do as a soldier (but would not do if they could avoid it), and such an enormous act of mass death, twice over.
I would also- because this is rather the crutch of the issue- like to ask the pro-virus people about their answer to the Sennacherib issue.