Not GP, but if they were my children, because they are small and innocent, I would pay attention to what they do online. They are your children, keeping them safe is primarily your responsibility, not Google's.
I'm not absolving Google or any company, they have a duty (and the commercial incentive) to solve this situation, but I think people here are magnifying the problem.
YouTube makes similar recommendations to what you search or watch, and ads based on some black box analysis. Pedophiles just slipped through the cracks in the system. The cracks need to be sealed, problem solved... until these people find new cracks to exploit. We can't kill them or get rid of them, so this cycle is perpetual. Excessive moral outrage only contributes to sell clicks and justify ill-thought laws.
I still disagree. The potential for the harm to get worse is there. I don't think there's anything excessive about making a public display of the issue.
A limited amount of regulation surrounding certain services could be a good thing, implementation-pending. In the same way that I'm glad engineers who design bridges have regulations to abide by in their projects.
The reasons those regulations [choose your field of application] arose in the first place was because there was new knowledge informing an improvement in the [application] and yet there were those willing to close their eyes to the newly obvious design flaws because it was more profitable to do so, and the market simply wasn't correcting for it as some would believe it naturally will.
I didn't know this was happening. Hell, I hadn't even considered it a possibility. I don't pay close enough attention to the social aspects of the site. I'm glad it was in the news.