...I think it's down to them being a bit dim rather than any pro child abusing ethos.
The choice you offer is too limited, either they are 'dim,' or they are 'pro child abuse.'
And it depends on what you mean by "them," Jehovah's Witnesses as individuals or the Organization that controls them.
Individual Witnesses might be a bit dim, but mainly they are heavily controlled. The truly evil thing is the Organization itself.
As to the 'pro child abuse' choice, neither JWs nor the Organization are pro child abuse per se. Most individual Witnesses are unaware of what goes on because they are told not to pay attention to any negative news items relating to JWs because it's 'Satan's persecution against God's innocent people.'
Their horrible lack of a workable child protection policy comes from the fact that the Organization needs to protect it's own public image. If innocent children are abused and fall by the wayside, the Organization's attitude is 'So be it, God's Organization comes first.' The child abuse is a result of the 'We are God's chosen people' attitude of JWs and their Organization.
"...1 is absolutely pro-JW, 5 is neutral and 10 is youtubing nutjob apostate..."
Why does 10 have to be related to a "nutjob apostate?" Why can't 10 be ex-JWs who are telling the truth about the Organization? There are plenty of those on Youtube and they are well worth watching.