Is it "human error" or bad design when all of Google search is disabled by a single misplaced slash? Human error is what Google has called it.
Link: "This site may harm your computer" on every search result?!?! (Official Google Blog). The comment at the end of the post that they will put in more file checks does indirectly acknowledge that the problem is not just with the user (edit to clarify: I don't mean Google's end-user; I mean the person that edited that blacklist file, who is the user of the internal Google/StopBadware system).
More context: Google Glitch Briefly Disrupts World's Search (NY Times Lede blog).
Some earlier rambling I did about human error: Blaming "Human Error".