...she's got conspiracy theory overload.

My theory is...some young American dude with a character deficit and access to a powerful gun tried to make up for the former with the latter.

-End off.

Your theory is attractive, however why can't one mention there is a possibility that this was a Ukrainian plot, playing up to (stroking of the ego) of a young American (a distant possibility - and not one's Occam's razor : ))?