Fetishes man, they're weird, and you should be able to do you as long as no one is getting hurt... and you're not trying to pass it off as something else.
The "rape=love" thing is what totally turned me off to yaoi, there are so many of those stories, and they all instill a super unhealthy mindset of what a good relationship is.
I think my whole problem with this is that KS in itself is not a BL, the creator says it's horror, the victim in the comic is obviously going though Stockholm stuff, abuse, possible grooming, he's watching and being forced to help this creep murder people. (At least he was the last time I read the comic) All the people, including the hosting company, are putting romance where it doesn't exist. That's like calling any horror movie a romance because you think the antagonist and protagonist make a hot couple.
I'm not saying this as a general thing about BL comics, I could not care less at the moment. I'm literally just being perplexed about Killing Stalking legit being considered BL... because it's not even doing the "rape=love" thing. It is just downright someone kidnapping a weird stalker kid who broke into his house, physically abusing and manipulating them, and also murdering other people who come into his house. (The last time I checked, it may have advanced in a more disturbing direction since then)