If you are part of an archaic institution, you have to live by archaic rules, I am afraid. You cannot detach the person from the institution, as without the institution, they would not be this level of public scrutiny.
If, for example, the pope decided to have a glass of wine and a vigorous massage of his private parts, I think there is nothing wrong with that. However, if he was indiscreet enough to do it on a balcony where someone took a photo, it would become a tabloid story.
Normally, there is nothing wrong with a man rubbing his privates, but put it in the context of the church and the most powerful representative of the institution, and it takes on a different dimension.
The problem with the monarchy and the church is that they are powerful institutions based on outdated norms, and as such, their reprentatives are held to the standards of their institution, not 'normal' society. If these people don't want to play by these onerous rules, then opt out of the institution.