Albuquerque Police Shooting: Justified Or Murder?

Some activists in Albuquerque are in an uproar over a shooting of a homeless man in the mountains around Albuquerque and yesterday, some of these activists/anarchists decided to riot in Albuquerque over the death of James Boyd.
From the Albuquerque Journal:What began as a peaceful protest on a sunny day in Albuquerque turned more and more unruly Sunday, as hundreds of people marched back and forth on Central Avenue until police threw more than two dozen canisters of tear gas and arrested at least half a dozen protesters.
Marchers took over much of Downtown and the university area during a daylong demonstration, where they called for accountability for Albuquerque police and justice for James M. Boyd, a homeless, mentally ill man who was shot and killed by officers March 16 in the Sandia foothills. Protesters also decried past APD officer-involved shootings.
The rally began at noon. After 9 p.m., police used around a dozen canisters of tear gas to disperse protesters near Central and Vassar, several people were seen being arrested, and Mayor Richard Berry said in a late-night news conference that an officer was injured.
“We respected their rights to protest, obviously,” Berry said, “but … they’ve taken it far beyond a normal protest.”
The march along Central boiled over at several points, with protesters ignoring police commands to disperse and having a standoff with officers in riot gear. The demonstration came after an online “hacktivist” group, known as Anonymous, issued a call to action in response to seeing video of Boyd’s shooting. The group also waged a cyberattack against the APD website, which was inaccessible throughout the day Sunday, and what appeared to be a number of officers’ personal phone numbers were released by a purported hacker.   http://www.abqjournal.com/376598/news/hundreds-hit-streets-in-protest-against-apd.html
Here is the video of the shooting to see for yourself if it is justified or not:

In the video, leading up to the shooting, you see the "victim" talk about violence and  murder while he has a knife in each hand.  The cops had been talking to the guy for several hours, per the news reports.
The cops tried non-lethal force but to no avail.
The "victim" already has been arrested for assaulting a police officer.  He also was charged in the past for assaulting another man and correctional officers.  He also has been arrested for knifing a man in the face.  Another time, when in jail, in a fight, he breaks a jailer's nose.  http://www.abqjournal.com/376292/news/incidents-involving-james.html
So, clearly, this guy is a threat to officers because of his behavior in the past and he has a history of harming people with knives.
The thug refuses to put down his knives he holds in both hands.
The idiots who are marching say the cops should have tasered him, but to do that, you have to be close to the guy to do it.  A man can quickly attack you and kill you with a knife in a second or two, even if he is 20-30 feet or two away.
Even after being shot, the guy refused to give up his knives.
The rioters say he was shot in the back but he was facing the cops and the police dog when he was shot and possible was going towards the officers.
I don't like it when cops kill people, but there are times when it is justified and this case certainly appears that it was.
All the thug had to do was put down the knives when told to by the cops.  Is that such an unreasonable request by the cops, who don't want to shoot anybody but they also want to go home to their families.
Too bad the guy died but he brought it upon himself.