The media always like to choose their words to attract maximum interest. The cctv however shows narrow winding streets with parked cars, impossible to go very fast.
Of course the police should have chased them (if they could have done), apprehended them and got them into juvenile court for underage driving/riding, not using a helmet, and failing to stop however they were of course fleeing as fast as they could with tragic consequences entirely of their own making.
Teenagers illegally riding motorbikes is an established problem in housing estates. They are a danger to pedestrians, motorists, parked vehicles and as we can see, to themselves. The worst kind are the off-road bikes.
I don't know about the West Midlands however the two newspaper websites I've just looked at (The Telegraph and The Guardian) both have the story way down the page.