Knives and gangs: What's driving Britain's broken boys to crime?

Updated 1654 GMT (0054 HKT) December 15, 2018

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London (CNN)After a long day at work, Tilisha Goupall returned to her London home, made dinner and switched on the TV, just like any other night. It was after 10.30 p.m. that she realized her 15-year-old brother, Jermaine, was more than an hour late home from the movies, so she sent him a message on Snapchat. He never read it.

Just minutes later, a police officer and a friend of Jermaine's knocked at her door -- her little brother had been stabbed, they told her. They led Goupall to a spot just two streets away, where the 26-year-old saw blood seeping onto the pavement from a police tent. She pushed past onlookers to talk to the authorities, only to be told Jermaine was dead.
"I just collapsed and cried -- the trauma from that moment made everything black," Goupall told CNN at her home, in the south London borough of Croydon.
Goupall points out the route by which her brother fled from the gang, two streets from their family's home.
It's a scene that's become all too familiar in London, where knife crime is soaring, mostly among young men and boys, some of them incredibly young.
Among just two of the many recent incidents: a 14-year-old boy was left in a