I think that'd make more sense if we're considering the actual, underlying topic under debate but they were responding to gramie's comment which didn't challenge their assertion that the cows were hurt but just went (more or less): "counterpoint: ice cream is yum yum".
In that context, going "sex is pleasurable, too, but rape is still wrong" isn't terribly out of left field, to me.
But I get what you mean, for sure.