A drone is a pretty extreme measure. A mistress is a very long term plan with long term ROI if not discovered and comes with the ability to influence decisions. It is far more valuable than being able to murder random people.

Agreed. The drone comment as an aside just to head-off people saying "Well actually people aren't so physically secure anymore..."

The point I'm trying to make is that people at this level can and often do have absolute physical security but have almost comical[0] lapses in psychological/mental security that lead to the kinds of things that you're describing.

The severity of this issue makes me wonder why it seemingly isn't accounted for appropriately in security threat modelling. You'd think that that the handlers for a dweeb like Huang or Gates would take the appropriate steps to mitigate the threat, if only by adopting harm-reduction principles and getting their CEO an in-house honey pot to proactively fend off external threats.

[0] https://www.youtube.com/watch?v=cP4d74Qk3ac