i only see two options. either the state of research funding and support in america is so bad that people lose their mental health and die by suicide, or its a murder campaign. theres no way all these deaths are coincidence.
It is worth double-checking your intuitions on these things. How large is the pool of people that you are considering anomalous and what would the base rate of accidental deaths or suicides be for a subset of the general population that size?