My ex’s ex step mom (mother of his half sister)

So my ex’s ex step mom lost her daughter a year ago due to poisoning her with Nitrous oxide (aka laughing gas) and she was malnourished. Same woman who posted pictures of her then 5 year old daughter in slutty clothes/poses and Topless on Facebook and tagged her now ex husband in the (condoning it), knowing he was under investigation for child porn (he had sex with minors in the basement of his store and recording it). When I was dating the son the basement of the business was off limits due to a “Rare PlayStation” that was being stored down there (I knew that was odd). Then he also hid a camera in the bathroom of his store in a fake smoke alarm and recorded girls (he even tried to get me to use the bathroom when I had to go...it was odd so I trusted my instincts and refused and walked across the street to the gas station. But all and all she says she has PTSD from her ex husband being busted (well what happened to that PTSD when you married him AFTER he was in prison and stayed with him for a whole year until you got busted for poisoning your daughter which was proven to have started way before he was convicted of the child porn). She’s getting her daughter back after all of this and people are okay with her getting her daughter back....like it makes me SICK