I constantly carbon copy myself at different addresses when emailing, so I have a record of what I wrote. It's not stupid to do, and we weren't given a complete list of addy's the emails were sent to.
It's pretty hard to fly a bunch of guns into Vegas. That's my first thought on driving back.
Maybe it wouldn't so hard if he was actually working with the CIA or another deepstate org. According to the FBI docs his truck was found in a parking facility under a hotel, full of Ammonium Nitrate. This is maybe what he was driving back from Phoenix.
I hadn't heard that he had an ANFO bomb. That's an indication to me that he was in fact more than merely a convenient opportunity to conduct a terrorist attack, but was an actual participant.
Thanks!