Tierney believes that Loughner was very interested in pushing people's buttons—and that may have been why he listed Hitler's Mein Kampf as one of his favorite books on his YouTube page. (Loughner's mom is Jewish, according to Tierney.) Loughner sometimes approached strangers and would say "weird" things, Tierney recalls. "He would do it because he thought people were below him and he knew they wouldn't know what he was talking about."
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