It's important that people from different cultures are aware that beating their children, "exorcising evil spirits", FGM, breast ironing etc., are all wrong and illegal in this country. I think education is the key and regular talks relating to these sorts of issues should be set up in schools.
There is no evidence that these abuses have been discovered but not pursued due to "cultural sensitivity". I'm not quite sure how it can be determined that breast ironing has occurred unless a child reports it - and I imagine that a child would not want to get a parent into trouble.
Only yesterday it was reported that a young white British mother had been found guilty of stamping to death her 21 month old baby who had, I believe, been on the at risk register virtually since birth. It wasn't "cultural sensitivity" that prevented this child - or thousands of other white British children - from being removed from families that are deemed to pose a potential risk to a child. Social services are under such pressure from an increasing case load and a decreasing staff team, and from constant media/public scrutiny and criticism - either for removing children from their families or for not removing them. There is also a huge shortage of foster parents and suitable children's homes.
In my opinion, using language like "these people", "barbarians", "uneducated people", etc. etc., does nothing whatever to help children at risk.