Photo-Illustration: Intelligencer; Photo: Getty Images After spectacular acts of violence, the hunt for suspects’ online trails — and the sources of their presumptive radicalization — often begins before a name has even been officially confirmed. Sometimes, as in the case of the 23-year-old mass shooter who targeted a Minneapolis Catholic school in August, posts provide evidence of nihilistic ideologies or other motivations (in that instance, an apparent idolization of other mass shooters and a