The article explicitly argues CoC's should be done better, but it's also a story of collateral damage. The author might believe these issues are infrequent and a non-issue but not all the readers share this belief and I don't think there is anything wrong with that reaction.
I wouldn't call that an "invalid" opinion or critique, and again I would think it's an expected reaction. But it would be overly broad, based solely on that incident. Of course we don't exist in a vacuum, so I'd expect that other information would be brought in to support such an argument. Fair enough.
However, an argument that draws an isomorphic relationship between the ability to target a document and the ability to target a bomb is probably attempting to draw outside the lines.
(Particularly since in this case, it's equivalent to the victim of the bombing being the one who is reporting on the incident and quite clearly stating despite what they've been through "I support the thoughtful bombing of terrorists, but that is not what happened in this case.")