"...,a viable alternative to not relying blindly on the categorization system, would be implementing a new "image reviewer" flag on en.wp and maybe in commons. This method would create a list of reviewed images that can be considered objectionable, that could be filtered/black-listed.
We could also just delete them, unless someone actually uses them in a sensible way in an article. :-)
sincerely, Kim Bruning
Not on Commons; being "objectionable" to some viewers and not being currently in use does not make a potentially educational image out of scope. I have seen many poorly worded deletion requests on Commons on the basis of a potentially useable image being "orphaned" rather than it being unrealistic to expect it to ever be used for an educational purpose.
Fae