Sounds like a slippery slope argument. Faulting victims for not knowing what to look out for has been happening ever since the first bully blamed another person for upsetting them. It’s not new, and I haven’t seen any evidence that these stories have increased such behavior. (Though if you have a source indicating otherwise, I will stand corrected.)

Consider as well, that access to how the criminal mind works hasn’t always been around. For most of human history, this stuff would not have been studied or understood to the depth that it can be today. With understanding comes empowerment. For those of us who’ve been abused, true crime stories can provide a lot of benefits, from helping us find a better understanding of what we’ve gone through, to increasing the general visibility for and understanding of mental health issues in society at large.

Not to say there aren’t issues with true crime media. Just that it provides powerful benefits for some people.