Stallman participated in an online discussion of the situation in which he condemned Epstein, but questioned whether or not Minsky had done wrong. It was not clear whether Minsky was aware that the woman had been coerced into having sex with him. There was a reply on the thread which said that the woman was under the age of consent in the country where the act was said to have taken place (but not in the US, I guess). Stallman further replied that in general (but not not necessarily specifically about this case) he felt it wasn't reasonable to quibble about that kind of technicality when discussing the morality of the situation (i.e. it would have been legal in one place, but not another). After that, there were pieces written by various web media outlets where they mis-quoted Stallman, alleging that he said things which he does not seem to have said.
So I think the OP is wondering out loud why it's not OK for Stallman to have a public opinion about the morality of the situation where it is apparently OK in one country, but if you go on holiday to another country it is rape.
The OP did not mention Epstein at all and it's not related to the discussion in any way. The problem is that the media has been waging a kind of character assassination of Stallman and quite frankly appears to have slandered him rather badly.
However, to answer the OP's musings: Stallman should know better than to get pulled into this kind of conversation because he has many political opponents who will stop at nothing to drag his name in the mud. He was completely stupid to respond at all. Maybe it's not fair, but it's reality.