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He didn't even appear to try.

It seems that he wants Safe Search effectively always On, so that he can leave his (now pointless) preference switched to Off.

The thing you're not getting is that the writer is apparently a puritan and wants to force his world view on you.

it's about results relevancy, here Google is saying that the #2 best result for "red top" is a porn image.

No, here Google is saying that the #2 best result for "red top" with porn included in your results is a porn image.

It could be possible that the porn image is actually one of the more desirable results if one is searching for "red top" with Safe Search off.