[simonh]

Most judicial systems would conclude that if for example you had extreme snuff porn on your computer, or the private personal records of another person, that there could be no legitimate procedure by which you could have obtained them. I don't think claiming that you extracted them from Pi, or 'could have done so' would be taken seriously as a defence.

The law for all it's flaws is ultimately a practical discipline, not abstract logic. Unless you're against all laws in general, which is a thing for some people.