There sure seems to be a lot of speculation here with little if any facts, so I will throw my hat into that ring.
The police officer that seemingly jumped out from behind the vehicle barricade appeared to know what he was doing, which was reckless in my opinion. It looked to me like the Militia vehicle actually tried to swerve up the hill further into the bank to miss him...either to keep from hitting him or because they were taking fire? After that, the shooting of the man outside of the vehicle was completely justified it appears. Not sure if shooting people in the rig was justified, if that happened in addition to the flash grenades.
I don't agree with the tactics of the militia at all (especially since they weren't protecting private property) and I do not know who is most at fault with how this all started originally with the Hammonds. But saying that the Hammonds are completely in the wrong with the Feds not having any responsibility in all of this (with the federal handling of ranchers water rights and road access, terrorism charges, & questionable prosecution practices, etc.) may be a stretch at this point?
I don't know any of the exact facts any more than anyone else here, but having met ranchers down there, and many years ago spending some time on the refuge doing small mammal studies makes me a little skeptical about the Feds story being 100% accurate...especially any part of that story told by the Oregonian newspaper.
The ranchers that I met were all salt of the earth people, and some of the ranches were there over 100 yrs ago developing irrigation networks and roads/trails out of a wilderness when the area was wild with bands of Paiute Warriors still passing through occasionally and no federal employee anywhere to be seen. And it amazes me how people here know anything about the appropriateness of grazing fees when they don't seem to know that much of the area is an actual desert with very limited production...and which is even more limited by the BLM increasingly restricting how much of the available grass can be grazed. This battle about the feds wanting to bring back the native bunch grasses and ranchers wanting to maintain their way of life has been going on for at least 30 yrs that I know of...but only one side in that battle has ultimate power that can possibly be abused in the eyes of some when you get an overzealous federal employee just following orders to squeeze the ranchers out?