Irreversible transactions do not make honour, ethic and law irrelevant.
I would really like to see a Bitcoin Adjudication service set up that, after considering the evidence presented before it, issues judgements not about statist law but about honour, ethic and reputation.
It would then be up to the perpetrator to decide whether to restore their honour. If they didn't, it would be up to the community to ostracise them. In a well-defined community, ostracism is a very powerful mechanism.
... until this 'service' became even slightly corrupt or makes a mistake, and now you have torches and pitchforks chasing some dude who is innocent.