Responding for any lurkers:
badminton, If you've worked in social care then you should know that safeguarding policies and guidance don't contain simplistic advice, ie "this photo makes someone unsuitable to work with children but that photo is OK". That's not what safeguarding looks like
There's a range of safeguarding policies and processes designed to ensure children's safety in voluntary and statutory organisations.
From the initial safer recruitment process (that presumably GG don't follow) which is designed deter unsuitable applicants from applying for roles with vulnerable groups, through to the safeguarding policies, protocols, understanding, training and ethos that applies to each organisation.
In relation to inappropriate photos, the questions that needs to be asked are whether this adult's behaviour demonstrates an understanding of the needs of children to have a safe, age appropriate environment? Is their behaviour in line with workplace guidance about social media and being an appropriate role model? Or does their behaviour demonstrate a clueless disregard for children's needs and they are therefore an unsuitable and possibly damaging role model.
You answer those questions using your collective safeguarding policies, knowledge and experience - along with relevant employment policies. Safeguarding trumps all the other policies.
No matter how much you like someone or feel sorry for them, child safeguarding always comes first.