I would hope that some of those expressing their opinions( predjudices?) above are not called to be on a jury given the task of deliberating on a matter like this. There are rarely simple facts.
You do not know the area, the reputations proudly built up by certain individuals within that area to let people be aware of their capacity and not to cross them. In fact it is their most effective weapon.
That, despite what you see on telly, not all criminals are stupid. Indeed successful??? criminals of necessity can be very clever. Playing at Sherlock Holmes is not going to catch people out.
No prints or DNA on the gun. Feck me! How thick do you think people are? If ,as alleged, he had just bought a gun from a known quartermaster, the one thing he would not have done is to contaminate it. He would have taken the gun, probably inside a appropriate length sock, provided by the QM. Why a sock? Because with one very quick motion one can sling the gun so that it lands some distance away. Mr Watson might opine that it would have a high trajectory, taking it over a fence, for example. Perhaps DNA or pocket material on the sock-who knows?
I know Ferry Lane very well, it's not exactly a lane, and whilst I don't know the exact spot, a reasoned guess is that the police would have sought to make what was a planned interception at a point where there was unlikely to be many bystanders- hopefully for reasons of public safety. If I am right it is not a general walking area and it is highly probable that any witnesses would been local and not more than a handful.
Any local witness would be terrified of possible repercussions if they said anything other than the party line. It would surely not come as a complete surprise that witnesses and sometimes police not infrequently, lie. Not saying they did on this occasion.
Would the police collude to protect a colleague, I have had first hand experience of that and proved that they (including a senior officer) were lying. That said I have a good friend who, until recent retirement was responsible for an area adjacent to Tottenham, and who certainly would have put a stop to any such collusion in his area.
Slightly to a tangent, imo , based on a reasonable amount of interaction, the vast majority of the black community abhor the activities of gang members and the effect these activities have on the wider perception of black/mixed race youth. Those outside the court do not represent the Black community.