It does sound possible, from his apparent email, that he knew some sort of dirt about a new weapon and about war crimes in Afghanistan. No way that DS wants that getting out.
General information about him seems to paint a Trump supporter. There seems to be a lot of effort into providing stuff he supposedly wrote. And we hear this right away. Hmm, haven't heard this level of stuff about the Trump assassins, have we? Or about the Vegas shooting back when. Or many many other things. BUT the information seems to make him a wacked-out Trump supporter. DS desperately needs this narrative. Trumpers as racist fascists wasn't working anymore. Maybe Trumpers as Terrorists is the New Thing.
And these people love chaos and destruction. They make people live in fear so they can be controlled. Look around at the fake news. They are having a field day with these terrorist attacks.
So, maybe DS set this up by getting to the truck ahead of time, killing Livelsberger, adding amateur explosives to the truck (kinda a stupid move on their part), and remote controlling the truck and the explosion.
What say you? Remember this from babylonbee (https://babylonbee.com/news/fbi-asks-x-users-to-please-stop-solving-crime-before-they-do). The FBI wants us to stop solving crimes instead of them. So that means we shift into high gear.
Two other alternatives I suppose could be that he actually did kill himself, but because they had driven him into a corner in some way, and maybe told him to do it or else - maybe threat his family or something? - or he knew they would murder him and he could not get away, so he did kill himself but he figured a way to do it that would get as much attention as possible so that the things he had been trying to blow a whistle about would also.
Or that if the body actually is his he was murdered, but the murderer or murderers were "knuckleheads" who managed to do it in a way that would raise all these suspicions about the whole case instead of being dismissed as "vet with mental problems kills himself in a terrorist act" also by the public, and especially frogs, not just by the police and feds.
But the whole story certainly seems to stink. Whatever the truth may be, it doesn't look as it is what is now told in the news, that "vet - with maybe mental problems - kills himself in a terrorist act". It still might be, but if so there are still more than a few questions left, like why nobody seem to have heard that gunshot.