That truck driver in Los Angeles did occur to me, but I was thinking more of the social media brouhaha that follows every major event. There always seem to be a number of innocent people drawn into the fray by reason of the clothes they were wearing, the attacker(s) perceived motivation, or a prominent twitter member making an unfortunate post.
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Hope for the best and prepare for the worst.

The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane