[dragnet2]

https://www.blackandblondemedia.com/2017/09/24/huntington-beach-shooting-media-inflames-public-omitting-video/ And this is what occurred prior to the shoot.

The officer tased the suspect, which had little or no affect and the suspect kept quickly approaching the officer and then the suspect took a swing at the officer. The fight was on.

[dragnet2]

https://www.blackandblondemedia.com/2017/09/24/huntington-beach-shooting-media-inflames-public-omitting-video/

[UnwashedPeasant]

"The officer tased the suspect, which had little or no affect"

That is huge.

A trained cop should make a good-faith attempt to use non-lethal force first, if possible. Sounds like that happened here.