BOSTON (AP) — Federal investigators say they believe the man who carried out a mass shooting at Brown University and later killed a Massachusetts Institute of Technology professor did not act randomly. Instead, former Brown student Claudio Neves Valente, 48, appeared to target places and people for what they represented in his own life — institutions and individuals he associated with personal failure, missed opportunity and perceived injustice. In a detailed behavioral assessment released Wednesday, the FBI said Neves Valente, a Portuguese national, spent years planning the attack in isolation before killing two students and wounding nine others inside an engineering building on Dec. 13. Two days later, he killed MIT professor Nuno F.G. Loureiro at his home in Brookline, Massachusetts. Neves Valente was later found dead of an apparent self-inflicted gunshot wound inside a storage facility in Salem, New Hampshire, ending a multistate search.…