It's obviously a terrible thing that a man has been shot by police. While in modern Britain there can never be such a thing as a cast-iron guarantee against being shot by the police (ask the late Harry Stanley), and I don't know the facts of this particular case, a useful general rule is not to shoot at them first.
Even the mildest of men resents being shot at. If that man is a trained marksman, who just happens to have a loaded weapon on him and several similarly armed mates in attendance, then you're really pushing your luck.
A family friend of Mr Duggan, who gave her name only as Nikki, 53, said the man's friends and relatives had organised the protest because "something has to be done" and the marchers wanted "justice for the family."
"They're making their presence known because people are not happy," she added. "This guy was not violent. Yes, he was involved in things but he was not an aggressive person. He had never hurt anyone."
I'm shocked, shocked.