It was an article about Baby P, and the writer was basically saying, 'we're all crying over this photo of Baby P, an innocent toddler. The reality is that if he hadn't been killed, there's a strong chance he'd have grown up to become an abuser himself.
The reality also is that he would have had problems in school, emotional difficulties, problems with learning, possibly aggressive or violent behaviours through primary and secondary school.
It’s fine to look at a small child and think “I’d have taken him”, but the reality of caring for a child traumatised in infancy is very, very different - they carry that trauma with them and need a huge amount of support from parents, carers, schools and a range of professionals just to cope day by day. These are the kids folk don’t invite for play dates or to parties, they’re the kids who folk call on to be kicked out of school when the environment becomes too much for them and they kick off.
Traumatised children become traumatised teens become traumatised adults - they need lifelong support of varying kinds to heal and grow. But once they’re teens and struggling we forget the impact of trauma and try to discipline them using increasingly perjorative language, and once they reach adulthood no one has any consideration of how they’re early experiences might impact them.
In this case Sebastian was described as shy and quiet, these are the kids who get overlooked - unless he made a direct disclosure which he was unlikely to do for many reasons.
It’s also worth bearing in mind many, many children who have abusive, neglectful starts in life so go on to have healthy, productive lives - it’s not a fore gone conclusion by any means but the “cycle of abuse” theory means they become stigmatised by people who think it’s an inevitability.