Having read Tesla's, the RLG, and the LVS's accounts (which basically was the sam as the other 2), it seems to me the situation escalated to the point it got out of hand. If the guard was writing down the plate I would find it hard to justify hitting the guard with the Jeep.Given the photographer was told the sheriff was on the way it seems to me the reasonable thing to do was to wait and let the sheriff sort out what happened. I doubt the sheriff's response time would be anything but quick given Tesla's clout.
What I don't understand is why the photographer felt it necessary to climb a fence to get a picture. I've shot photos through a fence and wonder what required getting closer? A 200mm tele give you good reach even at a distance. More to the point, most companies will give journalists tours and access to a site, even though you'll get a PR dog and pony show in most cases. But, as a journalist, you need to develop sources if you think something bad is going on. Someone will generally be willing to talk, if off the record, without you needing to trespass and then try to get away. I've cold called companies to get information and it is surprising what people will tell you. You just need to start putting the pieces together, ask more questions, and build a story.
It will be interesting to see what happened as more details come out.