If you are comfortable with negative numbers, then you are already comfortable with the idea that a number can be tagged with an extra bit of information that represents a rotation. Complex numbers just generalize the choices available to you from 0 degrees and 180 degrees to arbitrary angles.
Maybe, but I strongly suspect that there were enough other things going in Trump’s favor that if she’d broken with Biden on Gaza–which is not nearly as easy as you make it sound–then we would have still ended up in the same place, except that different people would now be blaming her for that decision.
(Just to be clear, I am not saying that her campaign was flawless, only that it is easy to second guess.)