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Historically Competitive
No, words have meaning. And I think it's fair to call out the media if they're not referring to him as a suicide bomber because that's exactly what he did. But the traditional meaning of terrorism implies the crime had a political/religious purpose that he was attempting to further, so I think it's appropriate not to refer to him as a terrorist until such time as the FBI informs us of the results of their investigation. If you commit mass murder because you're nuts, then you're just a mass murderer. We unfortunately get a lot of mass murder in our country. Not all of it is referred to as terrorism, despite how terrifying it is.
Connor, I haven't seen anything yet to suggest a connection to the election. The only possible connection I've seen speculated in the media so far is AT&T. But given his age, ethnicity and personality, I wouldn't be astonished if something like that was a motivating factor. I'm just glad no one else was killed.
He installed security systems for a living, right? Seems like an aging IT hermit would fit the profile pretty well.