It’s not that surprising that he was a JP and a socialist. When a Bench recruits a group of new magistrates (usually a dozen or so at a time) they’re asked who they voted for at the last election. It is a requirement that, when the list of names is submitted to the Ministry of Justice for approval, it has to be “politically balanced”.My old boss (who was the best I ever had) outside work was a JP from the Home Counties who was also a socialist, which is a bizarre mix, so It could have been both tbf.
Perhaps surprisingly, the left wing magistrates that I used to know were generally also among those In favour of more severe sentences.