VENTURA, Calif.—An investigative report on a 2018 mass shooting during a Southern California bar’s “Country College Night” found the likely motive of the military veteran who carried out the attack was disdain for civilians and especially college students, a newspaper said. Ventura County sheriff’s detectives concluded in the 424-page report that Ian David Long, a Marine Corps veteran who served in Afghanistan, likely attacked the Borderline Bar & Grill in Thousand Oaks on Nov. 7, 2018, knowing of the college theme and that there would likely be many students present, the Ventura County Star said. “Though we cannot say with absolute certainty that this was the suspect’s motive, this is the working theory that has been established,” the report said. The Star reported that the investigative report was completed at least a year and a half ago and when it was finally released on Wednesday there were many redactions, including …