He has the right to bear arms. The police were the one who drew their weapons first, then shot him in the back. The victim never drew his weapon whatsoever.
So the police are supposed to wait and give him the chance to draw his weapon and fire upon them? I really urge you to think about that one for awhile. A police brutality protester and advocate went through various use of force scenarios (link below). After the experience, his philosophy was changed. When you're in the heat of the moment, you want to protect yourself. His own words after the experience were that its critical that people comply with police commands.
https://www.youtube.com/watch?v=yfi3Ndh3n-g
Again, it's silly to think that the police need to wait for a gun to be drawn for them to act upon it. If that was the standard, you'd see far less police officers (as it would be a far more risky job) and more police offer deaths (if the requirement is to have a gun drawn on you).
Put yourself in the position of the officer. You're in an area where you're informed suspects are likely armed. You come across one with his hands up, seeming to obey your commands to not move. Suddenly, he turns around to face the other officer and puts his hands around his jacket. You're proposing you wait for him to grab his gun and shoot at the officer?
Right to bear arms. If in fact he had used his gun to defend against his assassins, his life would have been saved and his 11 children would have their father still. Unfortunately, he didn't defend himself against the police, and they took the opportunity to shoot him in the back.
I'm not saying he would have fired, but circumstances clearly show that he was very capable of firing on the officers. They're preserving their own life. In a situation like that, if you don't listen to the police, that is what is going to happen.
I'd also like to point out that the 2nd amendment isn't clear cut:
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
With the preceding "a well regulated militia" makes it unclear whether the right lies in the people, or in an organized group tasked with defending the country.