If your (or their, the french intellectual elite's/literati's) philosophy is so morally vacuous that it fails to recognize the sexual exploitation of children and young teenagers as reprehensible, then it is worth less than nothing. It is an evil.
Consent is not enough, is the common modern view. Power structures and actual power matters too.
In some sense, surely advocating (almost successfully, if I recall correctly) for a repeal of age of consent laws must be worse than the crime itself. That is, if we are of the opinion that pedophilia is wrong. Consider the difference between orchestrating many murders and a single murder as an analogy.
No, Foucault (and the others on that list) have been let off the hook for too long. The aesthetician in me is horrified, youth is beauty and they want it defiled?
And a disclaimer; I am of course a conservative in every sense of the word, and this is my perspective.