Is he afraid of a stalker following him in a plane? He uses this as an excuse, then discredits himself by going on to threaten legal action against Sweeney. Wants it both ways.
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This is of course entirely separate from whether such info was used against Musk or his family, or whether such a possibility is sufficient grounds for attempting to silence those who make it easily accessible (it's still accessible thanks to ADS-B for anyone with basic technical skills and cares enough).