I went on to a true crime subreddit to see if they discussed a case that was local to my area. Instead I ended up reading some other post and clicking on the profile of the OP. He only posted in two subs: True Crime and a porn sub. He was a pretty regular poster on both. This is a HUGE red flag.
Another True Crime post was discussing a case where the man claimed "rough sex" as a defense to strangling a woman to death. A male poster wrote something to the effect of, "I really enjoy choking women during sex, how do I make sure I don't accidently kill her?"
Call me paranoid but I went into both men's profiles and created a dossier-type document for them both. I was able to find a pretty good description of them from clues in their posts (age range, race, location) one even posted his dental x-rays on another sub which I promptly took a screenshot of. If I hear of a murder or rape in their cities that sounds like it could be them, I will 100% be calling the police hotline with my info.
TL; DR: If a man is posting on true crime AND porn subs he is a psycho! Ted Bundy talked about the connection between murder, rape, and porn.
Reddit as a whole is a toxic place. Every time I have to read up something work related on there, I am reminded that it is inhabited by scrotes.