So, my thoughts on this are very mixed, I totally agree the topics posted should be on topic, moreover I appreciate and respect your point of view and also really like that Mr. PG doesn't post all the time -- I do think one thing you may be missing is what a page is supposed to be. As outlined by facebook:
Pages allow real organizations, businesses, celebrities and brands to communicate broadly with people who like them. Pages may only be created and managed by official representatives. So because the Mr. PG is a public figure page on Facebook, the assumption that is is being run by official representatives of Mr. PG is not a fault of the people on the page, it is an assumption based on "the rules" of facebook.  Where comments on how other pages are setup and managed could be argued at this point, where I think the separation is missing is that you officially represent the facebook Mr. PG fan club, that however is not clearly expressed on the page as the intent.  Now, I don't think every celebrity runs their own page on facebook, but I do think the intent is that every page should be run by "official representatives" ie: management groups (the same people responsible for the words celebrities say in interviews, for example).
So, I don't want to see the way Mr. PG is managed changed, and I don't even like that the facebook rules would seem to show that you need to change anything ... however, it does appear that you aren't following the guidelines, so clearly stating that it is a fan page may be a requirement for you to be in line ....
... ultimately right now if tourism PG, or whoever else is responsible for PR for Mr. PG said they wanted to run a page (presumably so they could sell more Mr. PG pins), your page would be the one that they would be able to claim ownership of.  With some changes that clearly outline you are a fan page however, I think you would be save to continue to manage the fan based page as long as you desire.