Irrespective of the down-votes, I do see another user expressing something similar. "I'm suspicious it is somehow related to the oil overlords. Big money, big risks."
Someone always says this anytime there's a plane crash and someone slightly famous dies, but frankly it would be a pretty stupid way to assassinate someone - hard to coordinate, and far too easy to leave a forensic trail that's a mile wide. Tesla is not and was never about to put any big oil company out of business; even if they were, it would be so much simpler to undermine the company by corrupting personnel with money, drugs or sex.
The sad facts are that taking off/landing a plane is hard work and doing so on instruments is particularly dangerous, and that being capable and successful does not confer immortality. It's not even tragic: it's just plain old bad luck for the colleagues and families of these people, and that's the saddest fact of all.
What did they do? Shoot a missile through the fog? Take it down with a privately owned F14? Plant a bomb on it before it took off?
It's a ridiculous hypothesis.
Have a non-fatal accident and you as pilot-in-command are required to report it within 72 hours, but no one from the NTSB is likely to ever see the aircraft in question in person.
Commercial Part 121 crashes get large amounts of attention and amazing levels of effort (the reconstruction of TWA800 is astonishing to me). If I bend my 182 and don't kill anyone, they'll only know about it because I have to tell them and they'll file my submission away.
Sabotaging a plane is easy, sabotaging a plane and leaving no trace is almost impossible.