I interpreted the original comment as saying that C is detrimental to the long term health of a piece of software in a similar way to how asbestos is detrimental to the long term health of humans.
I don’t think there was any suggestion made that C is detrimental to human health.
Yes, you're missing the logic.
> Excluding the assumption that C is unsafe, it contains purely facts.
You think C is carcinogenic and mere exposure to it kills?
From a "purely facts" PoV, leaving all emotion aside, C runs, and has done so for a number of decades, life-critical systems, including munitions, weapons, life-support, industrial machinery and aviation.
It's only because you are married to your argument that you think comparing C to a fatal poison is "pure facts".