I think part of this might be that as fun as this all is to talk about, it wasn't super fun for Robert Tappan Morris. My friends from back in the day are not OK with me talking about what they did, even though nothing happened to any of them.

For the sake of argument, let's assume that rtm finds the whole episode embarrassing or whatever and would prefer to avoid the topic. If pg is really his close friend, it makes sense that pg would defer from conversing about it (especially in public) simply out of respect for his friend.