Dictating online social media behaviour; how far is too far?

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I volunteer for a well-known charity here in the UK but for reasons that will become apparent in this post, I won't be mentioning which one. I and a couple of dozen others help out on their online forums, spotting the newbies, directing them to the right groups or showing them where they can find the advice they want. My user name there is in no way connected to the names I use here or elsewhere online. I chose it to be different when I first signed up five and a half years ago because that particular part of my life is compartmentalised. Today we've been told that we have to sign up to the charity's policies regarding the use of social media. I can completely agree to taking care about getting to know people who might want to lean on us a bit too heavily if we were made to feel we should become 'facebook friends' with forum members, but a lot of us had already made many friendships before we took on the volunteering role. Of course we can accept that it's only fair that we shouldn't say anything negative about the organisation on social media - that just stands to reason. If we don't respect the charity, we should resign as volunteers. What most of us are not impressed at being told that we should behave in a way that's compatible with the beliefs of the organisation - to be non-racist, non-religious, non-political etc. We're all grown ups and we'd like to think that we know how to behave like adults without having to be told what to do. My personal gripe is that IF I wanted to post a photo of my butt with a religious symbol on one cheek and a political party's logo on the other, surely that's entirely my own affair and nothing to do with the charity. I have no intention to pull off anything so extreme but I don't intend to be prevented from expressing political opinions - especially in the run up to the most important decision my country will make in my lifetime (whether to remain in or leave the European Union). Similarly, if I want to express my support for the victims of rape (we have a particularly high profile case involving a soccer player and I'm a member of a group that campaigns for the rights of his victim) or to rage against the extremes of gender stereotyping in children's toys (another friend leads a group that does that), then as far as I'm concerned, I'm going to do that. It's going to be interesting to see where this goes. Even my employers wouldn't dare to tell me what I can do in my private time so I'm baffled that an organisation for whom I volunteer thinks it's OK.