I haven't but now that's on my list. I'll be honest, it could be a romance, but that era of silent movies is always creepy just in how they were made.
I guess there isn't any spoilers here since this is public record but basically, Dahmer invited a boy over to take pics with the promise of alcohol and money. What ensued was tragic. The boy passed out from drinking and while Dahmer was out at the convenience store, the boy escaped but was still out of it and unable to verbalize his fear. Dahmer's neighbors called the police and reported that they should investigate Dahmer because the boy was a child. Dahmer returned and claimed the boy was not a boy, but rather 19 and was drinking heavily. He also said they were in a relationship and a few other things occurred after that where the police took his word over the neighbors. After the police left, he went back and murdered the boy. The crazy thing was Dahmer served time earlier for sexually assaulting the boy's brother. That poor family.
You left out some stuff. The boy had not just been drinking; Dahmer drugged him with spiked alcohol. Then while he was drugged, Dahmer drilled a small hole in his skull to effectively lobotomize him. Thinking the boy was nothing more than a safe zombie now, Dahmer felt secure in leaving for groceries. The boy tried to escape and could not verbalize his danger as you said, but it was because he had actual brain trauma. That was the reference to him bleeding from the head in the show. Dahmer explained it away as him having had too much to drink and hitting his head, but the blood was actually from a small drill hole in his skull.
I made it through the first episode and about half way through the second, I decided to turn it off. The first episode was a little too disturbing for me to continue and eventually episode 2 started down that same path. It seems to be well done and if someone can handle that kind of darkness, I guess it would be worth a watch.
If I were making this, it would be more of a procedural, from the police/victim POV, Dahmer would barely be in it, moved to the background. You could really highlight a lot of the failures of law enforcement and tell the story, without dwelling on the psychology of a true psychopath.
There is another documentary about Henry Lee Lucas called "the confession killer" that is worth watching. We had a thread about it a while back. Basically, he did kill a couple of family members, but everything else he probably made up with the help of the police who just wanted to close cases, cops came in from all over the country and got him to confess to crimes he could not have possibly done by offering him treats and feeding him information to repeat back to them. He even confessed to a crime that detective had totally made up after she suspected he was lying and being used by other cops.