I'm just going to go ahead and say that "free love" is a terribly inappropriate way to refer to sex trafficking, regardless of the age of the victims, unless you're being facetious (e.g., The Onion's "Penis Goofin'" allegations against Epstein).

I’m going to suggest re-reading the top level comment and the GP’s response. I don’t see anyone suggesting non-facetiously that free love and sex trafficking are synonymous nor that sex trafficking of adults is acceptable. I think the top level poster is being facetious; such a view is how these creeps might think. I think the respondent is, intentionally or mistakenly, ignoring that context and using the term at face value.