Alleged social media posts by the accused Buffalo grocery store shooter talk about the unfounded "Replacement" theory, and appear to show him wearing body armor. Cynthia Miller-Idriss spoke with Anne-Marie Green and Vladimir Duthiers on CBS News about why young people can be so susceptible to violent, hateful rhetoric online, and what parents need to watch out for. Miller-Idriss also wrote the book "Hate in the Homeland: The New Global Far Right."

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