After doing quite a bit of research on the Aggregate program and Mittelwerk there is one recurring factoid. That Von Braun's rocket are, supposedly, the only (mass-produced) weapon that was fired in anger to have killed more in it's construction than military usage.
Despite going through several books on war economics I couldn't find anything contradicting this. But history being so vast, and humans being so war-happy, I was wondering on the veracity of this claim.
So, is it true?
I think your question should perhaps differentiate between those killed in the development, and the vastly greater number of slave workers who died during the construction.
Because, it wasn't the weapon that killed the slave workers but the way that the slave workers were treated that led to their deaths.