I'm still convinced that it being called "full self driving" is misleading marketing and really needs to stop, since it isn't according to Tesla
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The much more likely hypothesis in my view is that he was helping Trump because of personal conviction (only in small parts motivated by naked self-interest).
You should expect rational billionaires to tend politically right out of pure self-interest and distorted perspective alone; because the universal thing that such parties reliably do when in power is cutting tax burden on the top end.
So this isn't so much of an assumption, as taking him at his word.