R0, I dont think we disagree.
Safeguarding frameworks should be written by people who understand safeguarding. (Not by Aimee Challenor or Pips Bunce.) People who, as you say, understand safeguarding.
Such frameworks should include who needs to be DBS checked and at what level, policies if supervising children on trips away, recruitment procedures - what certificates need to be seen and what references taken, training requirements - who needs to be trained in safeguarding, first aid etc, a designated welfare office and clear complaint procedures, insurance, etc.
As a naive volunteer whose 11 year old was part of a sports club, I was daunted by the three page check list, but as I worked through it I realised each and every item was important. (And indeed ticking all the boxes meant the Club avoided a couple of major problems.) In retrospect that check list was vital. And, appropriately written, would be equally useful for people in a variety of under resourced organisations, whether the Green Party, Coventry Pride and Prism, or even Mermaids. It took a fair amount of Googling to find a Mermaids safeguarding policy, and even then I could not be sure it was up to date. Plus it included an unsafe approach on involving parents. My experience in contrast was having to gather together the key policies, have them on the website where coaches and parents could see, and have them approved in order to get the accreditation.
I can fully understand community volunteers in a variety of roles not being expert in safeguarding, which is why there should be clear, sensible frameworks available, and organisations serving the community should be encouraged to gain accreditation. The police's role is to arrent and prosecute people like DC. Great if they also join the dots. And better if their returns on DBS applications are complete and accurate, but they can't be expected to fill gaps when organisations fail to carry out proper safeguarding checks.
I also feel that more attention need to be given to people who go into schools and provide advice, like Stonewall, Mermaids etc, to ensure that their advice is compatible with standard safeguarding procedures. If the Council educational department is not content, they should not be there.