Beating them with pool cues about the head and shoulders until their retinas detach would be a great consequence.

Would you sign up as an executor? Or would you rather have some other sadist to do it?

You have no idea how fast I would jump to be the one with the pool cue. They would have to reconsider light being the fastest thing in the universe.

It's not about sadism. It's about people getting deserved consequences for actions that greatly harmed a large number of people.

Me? I'm just tired of watching it all.

Treat people reasonably, and not be a Snidely Whiplash level of asshat or you get the pool cue.

Echr?

European Convention on Human Rights https://www.echr.coe.int/documents/d/echr/Convention_ENG

European Court of Human Rights.

Perhaps forced bankruptcy to personally pay back compensation to the Post Office. Follow the money the way they do with terrorists.