GP probably meant indefensible in the context of the law, not as a moral opinion. Defendant wasn't a doctor, customer wasn't a patient, and magic incantation was not uttered, therefore it was illegal under current laws.
What he pled guilty to was illegal, but that's irrelevant to indefensibility because he pled guilty.
Saying that he is utterly indefensible is saying that, because he is guilty of something illegal, instead of losing some freedoms, laws and rights no longer apply at all. Although we have no evidence of anything else to charge anyone with (which legally we need to conduct a search), we might find something if we can look. That's illegal and immoral, but we can and no one will stop it because they don't want to be seen supporting him. That seems to be the sense of indefensible meant.
The crime and it's result is one thing. Setting a precedent for free-range witch-hunts is another; those have a bad history.
Saying that he is utterly indefensible is saying that, because he is guilty of something illegal, instead of losing some freedoms, laws and rights no longer apply at all. Although we have no evidence of anything else to charge anyone with (which legally we need to conduct a search), we might find something if we can look. That's illegal and immoral, but we can and no one will stop it because they don't want to be seen supporting him. That seems to be the sense of indefensible meant.
The crime and it's result is one thing. Setting a precedent for free-range witch-hunts is another; those have a bad history.