I would guess BBC are instructed to act in a de-escalating way of reporting to not pour more oil into the fire.
It's the same principle as Police not behaving in an overly aggressive or repressive manner.
The death of the 3 young girls was kind of signal event and the best way to get control back in the streets is de-escalation.
(If anyone is interested, I found a very good 5-page analysis in German about the Duggan riots in 2011. Take it to a translator bit by bit, I think it's worth it, understanding the mechanism of riots. No paywall, left Berlin located outfit. No idea if it works in UK:)
https://taz.de/Essay-ueber-die-Randale-in-England/!5113472/