But suicide is an act (even if often either an irrational one committed by people in a disordered state of mind, or perhaps a desperate one by people with no path to happiness), and understanding any particular suicide is going to require understanding the thoughts and motivations of the person who killed themselves.
In this case, several people independently committed suicide due to largely identical circumstances. Sure, not everyone falsely implicated took the same action, but I don't think we need to look at their individual circumstances to understand the root cause.
framing suicide more like a disease that acted upon them
These people started off with agency, sure, but being falsely accused by the government, and having government employees and contractors giving false testimony, took away much of that agency.
Could you or I be 100% certain we wouldn't react the same way?