I don’t recall any of those fields of study.Do we know what the four victims were studying? Were any of them taking a class/classes that might have brought them into contact with dangerous people?
(Mostly thinking law or psych classes. Social services? I mean, there are cases where people have gotten killed because they got in the middle of child custody or domestic violence.)
Each victims interests, studies and career paths were noted in the Memorial statements published by their families and posted on an earlier thread.
Sports, marketing, and education come to mind.