Not a conspiracy, just imperfect people not doing their job properly.
Let's say, for one moment, that you are right, and that all the professionals in this case were imperfect.
What explanations are there for Rebecca's contradictory behaviour and actions?
She registered Ethan's birth alongside his dad, and Ethan took his dad's name - which she had to agree to as they are not married.
A few weeks later, their relationship breaks down and she withholds contact; subsequently justifying her action to prevent Ethan seeing his dad at that point by saying he was a risk to Ethan, even when supervised by herself.
if that was true, why did she register Ethan with his Dad's name?
She alleged that Ethan's dad takes drugs. Those allegations were investigated, during which period, Ethan did not spend any regular time with his dad.
No evidence was found to support the allegations of drug taking, so contact was ordered.
Rebecca then alleged that Ethan's dad was abusing him. Contact is stopped while the allegations are investigated.
why did Rebecca wait until after contact had been ordered to resume before she mentioned her belief that Ethan was being abused?
There was no evidence that these allegations are true, so contact resumes, with Ethan spending 4 days a week with his dad.
If Rebecca believed her own allegations and that Ethan was at risk, why didn't she flee with Ethan then in order to protect him?
Rebecca got told that SocServ were recommending that Ethan lives with his Dad and she took him to a hospital alleging further sexual abuse.
Why did she wait until the night before the court hearing to have Ethan examined again?
And why, oh why, did she say in her interview with the DM that her decision to flee was a spur of the moment decision, when her mums partner had gone on court record as saying it was planned the night before, resulting in him being jailed for 28 days?