The incident which sparked the protest rally is reported here -
Tottenham shooting: Investigation launched after man shot dead by police | News
..and it is interesting to note one eye witness said -
"About three or four police officers had both men pinned on the ground at gunpoint. They were really big guns and then I heard four loud shots. The police shot him on the floor."
This is reminiscent of the death of John Charles Menesez
Death of Jean Charles de Menezes - Wikipedia, the free encyclopedia
The officers of Operation Trident are performing a difficult and dangerous function to remove guns from the streets.
They have had some successes but if they stoop to assassinations they are acting outside the laws they purport to uphold.
Press reports and subsequent 'enquiries' cannot be relied be relied on to reveal the truth.
The Government spending cuts are likely to cause Operation Trident to be disbanded, so the officers employed in it are likely to be having 'low morale' as their efforts have been worthless.
Operation Trident may be ditched in spending cuts | UK news | The Guardian
When you stand back from 'judging' what has happened and delve into the underlying causes, it does not make what happened 'excusable' but at least it makes the incident 'understandable'