Among other things, I found out a coworker threatened violence against me in a chat to their two accomplices. I have not seen the actual threat. Said coworker was allowed to resign immediately but the accomplices are allowed to finish out their two weeks. The coworker will be driven over by one of the accomplices to get their stuff, apparently unsupervised after hours. No one from HR or upper management has contacted me. My supervisor told me the supervisor doesn’t want to jeopardize their future hire ability. Is it understandable that I am concerned about this situation? I just feel their productivity is being placed above my health and safety. For context this is a professional office in the US.