The internet has a pretty weird obsession with serial killers. Back in 2019, a surge of Ted Bundy-related content released, with Zac Efron even portraying him on film. This caused plenty of internet-users to express attraction toward the killer, who had also received plenty of love letters during his prison sentence.
Even before then, there were groups on the internet thirsting over serial killers, despite the fact that these men literally killed people (and typically did much worse things, too).