One has to admire such a commitment to digging in, in the face of all the evidence.
The officers didn’t know who he was. But - to put being obtuse to one side for a moment and focus on the facts - from the link, they did know this and they knew they were about to place themselves in danger:
”At 7pm firearms officers were briefed at the start of their 12-hour shift. They were told about the Brixton shooting, how the gun was still outstanding and that the suspects were at large. A firearms marker had been placed on the Audi Q8. Intelligence indicated a “ride-out” — looking for enemies with intent to cause them harm — by 17 into 67 territory and there were warnings of “further incidents in the coming weeks”.
Later that evening Kaba said that he was going to visit a friend. He hugged his mother and set off in the crossover SUV coupé, which generates 0-60 mph in 5.6 seconds. It would be the last time Lumuanganu saw him alive.
The silent follow
At 9.51pm a firearms officer sitting in the back of an unmarked Volvo named “Alpha” clocked the Audi driving towards them in Camberwell. “That’s one of the vehicles, get in,” he said to his two colleagues after recognising the number plate circulated at the briefing.
The officer, known only as DS87, stood outside to see which direction the car was travelling. At 9.55pm a firearms incident was declared. The officers were unaware of the driver’s identity when they began the silent follow.
The operational firearms commander gave directions of the tactic: an enforced stop with extraction. Some officers believed the driver did not know he was being pursued but others said his “circuitous” route suggested that he was aware.
A court was told that at 9.57pm, Kaba phoned his friend and said: “I think there are police behind me.”
As Kaba turned into Kirkstall Gardens the Foxtrot vehicle, coincidentally, was parked on the street. Residents’ cars were in bays either side of the road so the stop tactic was adapted.
An officer in the car behind Kaba shouted: “We’re going to do it here. INLINE. INLINE. INLINE.”
The ARV emerged from behind a white Tesla and drove forward while the unmarked Volvo boxed Kaba in from behind”
It is all explained at the link. Sorry the facts don’t fit what you would prefer to have happened.