Except closer examination of what happened showed WHY those mistakes were made- these people were afraid of being called racist; that isn't in question, many of them have explicitly said this. There are reasons for those errors in judgement which need to be addressed and not swept under the rug. There is broad confirmation of that, and these "mistakes" are not to be minimized because thousands of girls were raped and abused. "Systemic failure" is a good way to make it amorphous and nebulous, so real responsibility doesn't have to be examined in terms of why it happened. With whatever other causes were involved, there is no questioning that a whole lot of it had to do with being PC, and that people who DID report it appropriately were demonized, those are facts. We aren't "moving on" because it doesn't agree with someone's ideology, we will address this for the sake of the victims; massive amounts of children were raped and abused, and that isn't getting swept under the rug.
One thing I agree with is that racism was partially to do with the threat, but not in the way you think. Many of the victims talk about various derogatory, demeaning racist names that the Pakistani men who were the perps have for the white women they abused.