Copyright <> Morals
The difference here is intellectual property rights vs. societal norms.
Having a mechanism in place where copyright holders can submit hashes to match against submitted works from the public and mark possible infringements is not necessarily a bad thing - as long as derivitive works and public use rights are not stamped out.
Trying to enforce societal norms against "questionable" material through an automated set of rules would be a pointless endeavor.
Whose societal rules do you use? You CANNOT say the "best" one or yours just because you know them - What works for you might be completely intolerable to you neighbor, and vice versa. And NO, YOU CANNOT say "use country controls" because it must be more granular than by country or county - even if ALL your neighbors are in other countries. This would construct a "least common" denominator, and we all know how well THAT works (In case you don't - NOT AT ALL). :(
By staying out of the subjective realm of morals, they keep themselves from taking the express lane to become complete gits. Odd from Google, eh?
So, sorry - you will all have to retain your right to personal responsibility and accountability. Google is worried about selling advertising based on your habits, NOT (yet) in being the nanny that says what you can and cannot see based on morals. Isn't that why you have NuLabor?