I enjoy crime/psychological thrillers. Like others here, I like the forensic analysis, the process of unpicking and finally solving the crime. I also feel reassured that good (almost ) always, triumphs over evil.
I watched a couple of episodes of the recent tv drama, based on the real life story of a dentist, played by James Nesbitt. The events took places in a small town/village in Northern Ireland. The dentist and his family, his lover and her family were very religious. I think they were involved in a Baptist Church but in any event, their faith was central to their lives. Despite this, he murdered his wife and her husband. I found the drama very difficult to watch, it was chilling and the fact it was based on real life events made me feel uncomfortable. The children and other family/friends were still alive and must have found it so intrusive.
To describe those with an interest in true crime as prurient seems judgemental to me. I don't seek it out and as I said, I found the Nesbit drama unsettling, only watched a couple of the final episodes and was chilled but - I wouldn't judge others for their interest.