The Cartoonist John "Derp" Backderf was actually a classmate of Dahmer's in the late 70's. According to Derp, Richfield in general & Revere High in particular was such a "Twin Peaks" level of fucked-upness that when his wife called him up to tell him that someone he went to school with had become a serial killer & busted with bodies in his home, Dahmer was his fourth or fifth guess.
Derf's a cartoonist, but he has a degree in Journalism & he released the excellent graphic novel "My Friend Dahmer" & he makes it quite clear that every single adult in Dahmer's life completely & utterly failed him, starting with his parents. His father abandoned his family b/c he'd had it with his wife's unwillingness to treat her mental illness that was tearing the family apart, & his mother abandoned him while taking his younger brother with her. By the time he graduated High School, he'd been living alone in his isolated home for over a year.
The cartoonist John "Derf" Backderf actually went to high school with Dahmer, & according to him, his high school milieu was such a "Twin Peaks" level of fucked-up that when his wife called him up one day to tell him that someone he went to high school with had become a serial murderer & had been found with bodies stashed in their home, Dahmer was his third or fourth guess.
What makes Dahmer a sympathetic figure was the level of abandonment he was subjected to as a child. By the time he graduated from Richfield High, both of his parents had abandoned him & he was living in his parents isolated house on the suburban peripheries all by himself. His father had walked out on the family due to his mother's outsized, & mishandled neuroses, followed later by not only his Mother abandoning him but taking his younger brother with her, reinforcing the messaging he was getting that told him he was the invisible boy & unworthy of any attention, never mind care or compassion.
Reading the book makes it clear that the "Milwaukee Cannibal" was failed by every single adult in his life, so I don't buy for a second anything about his Father trying to help.
http://www.amazon.com/My-Friend-Dahmer-Derf-Backderf/dp/1419702165 you should ask your dad if he knows the guy who wrote this? I read about him in a Chuck Klosterman book where he talks about people have known serial killers.