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Magazine + WSJ Puzzles + Off Duty Podcast + The Future of Everything * Real Estate + Sections + Commercial Real Estate + House of the Day + Mansion + More + Real Estate Video Search ____________________________ (BUTTON) SEARCH → Subscribe Sign In Trump’s New York Advantage Review & Outlook Trump’s New York Advantage $29 Oil and the Dollar Review & Outlook $29 Oil and the Dollar Honest and Dishonest Socialism Review & Outlook Honest and Dishonest Socialism The Terrorists Freed by Obama The Terrorists Freed by Obama Trying to Build a Catskills Resort Despite Mountains of Regulation Cross Country Trying to Build a Catskills Resort Despite Mountains of Regulation How Obama Can Revive His Stalling Trade Pacts How Obama Can Revive His Stalling Trade Pacts The Democratic Crack-Up Potomac Watch The Democratic Crack-Up Sing a Song of England Sing a Song of England The High Cost of a Bad Reputation DECLARATIONS The High Cost of a Bad Reputation Obama’s Legacy: Trump and Bernie Wonder Land Obama’s Legacy: Trump and Bernie GM Speaks Untruth to Power Business World GM Speaks Untruth to Power Yet Another Vast Right-Wing Conspiracy Bookshelf Yet Another Vast Right-Wing Conspiracy Painting Poetry Painting Poetry * 480 Save Article Sign In to Save Subscribe to WSJ Text Size Regular Medium Large Google+ Print * Opinion * Columnists * Business World Big Data and Mass Shootings This month Hitachi launched a test of its crime-prediction software in several American cities. By Holman W. Jenkins, Jr. Oct. 9, 2015 6:21 p.m. ET As always, the dots are connected after the fact, when the connecting is easy. He was booted from the military after a single month for attempting suicide. His mother advertised in numerous social-media posts his mental problems and fascination with guns. He posted his own threat on a chat site used by insecure young men, warning that students in the “northwest” should avoid school the next day. With the usual upturned hands, experts in the aftermath tell us that “tens of thousands of people” exhibit the social isolation... 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