Of these justifications, the most irritating by far is “It never did me any harm”. If it hadn’t done me any harm I wouldn’t be on this forum now. I assume most here would have to say the same. There is a wound somewhere in our heads, an attraction/repellance paradox, which at its mildest can merely be called a tendency to waste time stewing over ancient history. At its worst, it is responsible for perverting normal sexuality. In some cases it destroys marriages. Whether mild or severe, that counts as damage.
If sometimes mothers said things like “it’ll do him good” when they found out their son had been beaten (even though most of them never had to suffer such things themselves), would they still say so twenty years later when they found their son to be exhibiting an abnormal interest in the subject?