Well, if people all over the world were under a constant daily threat getting seriously ill from bio-weapons used by criminals and governments world wide (even against their own people), as is the current global situation in software security, then yes, I would very much make that same statement.
I would even argue that, especially in the case of bio-weapons, it would be a moral imperative to spread knowledge that could cure people.
Remember that (going back to the cybersecurity analogy) the criminals already have the weapons, as well as the knowledge and capability to develop completely novel weapons from scratch (they might even be better at it than the US).
For missiles the argument doesn't really hold, because knowledge of how to detect and protect oneself from missile attacks neither requires, nor strictly includes knowledge of how to actually build and use said missile.
So the two big reasonable arguments are:
- cyber attacks are already widespread, including global criminal organisations targeting civilians
- both cyber offence and cyber defence enabled by the same knowledge of cyber security