I think you'd agree that parents will feel differently about the level of censorship. I specifically set my setting to "Use strict filtering" which google clarifies by saying "Filter both explicit text and explicit images". An innocent search phrase like "i love to eat" now suggests that you select some other search terms. I myself have been coerced to a different search phrase because of google instant, so I think children are the same way - saves them from typing.

I agree with you about responsible parenting (which also differs from person to person). It is for this reason, I select "strict filtering". The explicit texts in that result certainly have not been filtered. I guarantee that if google finds out about this, they will change this result.