Point taken, but these situations are much more fuzzy. If I understood correctly, this was an automated detection of possible child pornography. In such a case it would seem likely that Google acting proactively has no culpability. The only legal requirement (from the many articles I've read on the subject) is to remove illegal content once the company is made aware. Automated detection based on heuristics likely would not fall under that category.

If specific pictures are under question and a human deems them likely to be illegal they can disable access to those pictures. They have no legal responsibility to prevent access to legal data.

Edit: downvoting without a rebuttal is cowardly at best.