@Andreas Nurbo -
WHy should he contact you?
Among other reasons, he is the only one who has the basic information that will identify the offenders.
Its your users and your fans that is doing this.
If you drink & drive in your GMC vehicle, do a hit-and-run, etc, will we then demand that General Motors explain themselves? The criminal is responsible for the criminal act. Now ... you might have something, if you can show that use of the WordPress product leads to loss of self-control, legal insanity, etc ... AND ... that those who released the unsafe product onto an unsuspecting public, knew beforehand that it had these dangerous effects on the user.