Sharing an image put in the public domain is what Twitter and all social media platforms do - if you put up a picture there it's with full knowledge that it will be shared as far as it happens to run. Unless you choose of course to put your picture up on a private account within privacy settings, to prevent that being able to happen. Which is a pretty good idea when you're sharing very private pictures that you don't want seen far and wide, or don't want to reflect on you badly if they're seen by people for example who relate to you in your workplace and role.
If you share a picture and it goes viral and that reflects badly on you and your job and your workplace? Well you made a bad decision. You can't wail that you can't be held responsible because it was shared in ways you for some reason hadn't managed to foresee. You'd think the massive fail of the TW who posted pictures of themselves in a Brownie leader uniform carrying guns might have clued others in on basic things like this.
And there's such a thing as public interest. Serious public interest. Like the behaviour, ethics and boundaries/safeguarding awareness of those working in top roles in a children's charity.
So I do hope this one goes to court. I'm sure Maya would be more than happy to put across the reasons above and more, and I'm sure Ben is warming up the support wren.