I've been reading the word unprecedented a lot today. For reference, here's Obama unambiguously joking about drone-murdering the Jonas Brothers: https://www.youtube.com/watch?v=WWKG6ZmgAX4
Political assassination is a real thing that happens; federal drones attacking celebrities is not as common. The Jonas Brothers are not Obama's political opponents. Our country is not full of weaponized drone owners. These are two very different "jokes".
My concern is more about the many foreign civilians killed by America's drone program than any real belief that it would be used against the Jonas Brothers.
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On January 8, 2011, U.S. Representative Gabrielle Giffords and eighteen others were shot during a constituent meeting held in a supermarket parking lot in Casas Adobes, Arizona, in the Tucson metropolitan area. Six people died, including federal District Court Chief Judge John Roll; Gabe Zimmerman, one of Rep. Giffords' staffers; and a nine-year-old girl, Christina-Taylor Green.[1][2][3][4][5] Giffords was holding the meeting, called "Congress on Your Corner" in the parking lot of a Safeway store when Jared Lee Loughner drew a pistol and shot her in the head before proceeding to fire on other people.[2][3] One additional person was injured in the immediate aftermath of the shooting.[6] News reports identified the target of the attack as Giffords, a Democrat representing Arizona's 8th congressional district.[2] She was shot through the head at point-blank range, and her medical condition was initially described as "critical".[2][3]
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I'm glad we can find the humor in situations like these.