Pardon my ignorance, as it's never been relevant to his work, but where does Pieter live? In the US there's a chance posting that would get the police to your door, sadly.
The public support for euthanasia is also overwhelming. The only parties against are mostly the catholic church but their influence is nil as we have a clear separation of church and state.
Also, he's from Belgium. Also, at this point, it's more of a peaceful way to leave than the agony of letting cancer do it slowly and painfully from within your body.
Arrest any doctors and nurses involved and prosecute them for assisting with a suicide, and pursue professional de-registration of those clinicians.
Has this happened?