Red flags and warnings ignored. Was it possible to avoid the tragedy?

Note from the prison service and in it, the words of Stefan W. "I would like for Jarosław Kaczyński to be a dictator" and "I don't want to be in Pomerania because it's a home of Civic Platform". The would be murdered said in a conversation that would be noted and one day before his release, sent to police. There were lots of red flags and warnings but did anyone pay attention?