A Trooper is most Vulnerable on a traffic Stop. I can't imagine doing what they do without already having the gun drawn. Lubbock County hasn't lost very many Troopers over the years, but I do remember a Trooper being killed the same way out on the highway to Slaton in the Mid 70's. That perp was caught and eventually executed.
If you kill a Trooper, or even a City Cop, odds are you will die a premature death, one way or another. I think most of Cop shooters know that. Some want a final showdown with the cops. This guy took the Coward's way out, didn't want to take a chance on being shot in the gut or paralyzed, or worse yet, setting on death row for 9-16 years, pretty much in solitary. Those guys on death row are caged animals, a worse fate probably than a merciful death.
If they are doing suicide by cop, they don't usually want to hurt anyone else, but some nutcase will want to take as many out with him as he can. That is precisely why we need our rights to carry and personal protection.
The Luby's Cafeteria Massacre in Kileen, TX that killed 23 people would not have been near as severe if only 1/2 th of the people who carried today had carried back then. That Luby's Prototype Building had three hundred seats. That became an industry standard as if they went above that number, had to add to restroom facilities. My point, out of 300 people when busy, 1/4th would be adult men. There would have been 75 adult men. In Texas today, I would say 1 in 15 Texas adult men carry. So the odds today are that there could have been 5 adult men with firearms to return fire. I can nearly guarantee there would have been two adult females with handguns. In that situation, you better not be worrying about any laws, you better be retreating, finding cover and then firing on the bad guy. If you have a chance to retreat early on, it may give you a chance to see what is really happening.
My point is, there are some bad folks out there, you hope you never cross their path, but someone will and a LEO has a better chance of meeting them. We can just all pray that we never do and be prepared if we do.