"sending a message to everyone else" - is a pretty big incentive.
Think about Boeing's whistleblowers.
Even if they do not kill them directly, they bury them under so much legal fees that they are financially ruined for life, their career broken and through clandestine PR operations destroy even their social life and public image to make an example of them.
Extra suspicious because his plan was to drive home that night to his family. The other side convinced him to stay for one more day of hearing, if I recall. And that night he stayed he mysteriously died.
Think about Boeing's whistleblowers.
Even if they do not kill them directly, they bury them under so much legal fees that they are financially ruined for life, their career broken and through clandestine PR operations destroy even their social life and public image to make an example of them.