How alleged New Zealand mosque shooter went from world traveler to hatemonger

He spent two years planning. He wrote a rambling, racist 16,500-word screed stuffed with memes, poems and video-game references. Then Brenton Tarrant allegedly stormed two New Zealand mosques and slaughtered worshippers with an assault weapon scrawled with white-supremacist slogans -- while broadcasting the whole horrifying attack to world. The man charged with murder for the...