It's very weird to think that people would even care enough about a dead person to single out your brain for "payback". Even weirder to think that these people would somehow be in power.
Read more history. Vindictiveness is a pretty common trait among authoritarians.
This idea was somewhat explored in Iain M. Banks _surface detail_, after death, your conciousness would be put into a virtual hell if you 'sinned' in your physical life and that the hells were used as a deterrent