Because I haven't seen any evidence.
What I have seen is LaVoy sitting in the truck and sticking his head out of the window, jawing with the LEOs for minutes.
Why would he think he would get shot if he exited but wouldn't get shot if he sat there like a sitting duck? Especially since his partners had already surrendered and not been executed.
This scenario you're concocting just doesn't hold together if you give it any thought.
So, your version of the in-truck video has no sound, just like the overhead video of the shooting. LOL!
You can HEAR Ryan Bundy and Finicum repeatedly try to pry out of the unidentified men who they are. They finally say that they're "Oregon state police" - who wear distinctive blue uniforms with blue Mountie hats.
Which these guys were apparently NOT wearing.