Whether it's your own death or theirs, it just seems to be completely normal. I used to crave being fucked to death while eating men's shit or having them eat my body as I died. And I used to be able to almost cum spontaneously without jerking by intensely imaging being stabbed to death by a satyr with a butcher knife.
Such perversion is about being a human male.
On other threads I've referred to the french phrase for sex or orgasm "le petite mort" (the little death) and those WW1 stories about the battlefields of France where hundreds of thousands of men died in a single day, and some of the officers and surviving soliders who later perused these acres of gore and dismemberment and rot were often consumed by an overwhelming, exhilerating, hyperventilating, adrenaline-fueled sexual high they'd never known and didn't understand. (Many of them had never been sexually sadistic nor had conscious homosexual tendenices prior to this). Their own bodies' reactions to the carnage produced spontaneous ejaculation in some, or they returned to the barracks and masturbated furiously to unprecedented climaxes.
And that was only the men who reported it. Most obviously didn't.
But it permanently changed some of their sexuality, and not all of these men were happy about it, especially for the ones who resisted their new compulsion (some couldn't get the images out of their mind, or could no longer cum with a partner without visualizing those war fields, even years later).
And the military had to send out men to round up necrophiliacs, AWOL soldiers or nearby villagers who were sodomizing the dead bodies and had to be "stopped."
So it's normal. People often say death is part of life, but death is also part of sex and sexuality. Especially for men and especially for men who are into other men. And like much of sex, who you're attracted to and what fetishes compel you, death sex interests are mysterious but simply exist.
You can resist them, feel they're 'wrong' and try to put them out of your mind. But the urges always come back, sometimes more intensely because you'd denied them for a while. And every time you re-discover how much you crave that dark kind of sex or porn, re-discover how hopelessly perverted you are, it's thrilling. It's like living in a house all of your life, then one day waking up an discovering or re-discovering a new, beautiful wing of that house, one where there are no rules and anything goes. Then you really know who you are. And it's delicious, like the natural graduation spot for Sex and accepting it as such.
I developed incest fantasiens during puberty and even disability fetishes shocking early, raunch fixations after that and then death and gore obsessions in high school and beyond. They fascinated me to the exclusion of almost everything else. And what's more, it felt healthy: a young man learning who he was, and eventually how normal and common these sensations were amongst young men. They didn't prevent me from functioning or from having normal partnerships (though I do believe two husbands or male lovers who don't share with and expose to each other this side of themselves lack an intimacy or a joy-bond I find very important in a romance). And I never killed a soul. It wasn't necessary. But I did want to meet and maybe marry a nice mortician.
When I was in my teens, whenever I met a guy I found very attractive, I usually very soon pictured him decapitated and disemboweled, his eyes gouged and me fucking, licking and chewing on all of it. It was a sign I liked him.
Watching one of the videos here of the decapitated body and handsome head being stabbed and tossed around, with all the young men hooting and hollering (I could swear one of the witnesses seems to have some major semi-wood) there's no debating the vibe is utterly sexual. Gay, straight or bi is meaningless in that context. They are men. Their bonding and delight, their necro-sexual camaraderie, is instinctive and beautiful, including what some of them may have just learned about their own identity.
It doesn't matter that the sexuality is unspoken. Every guys knows. And their feelings of exultation is addictive and infectious.
http://cutedeadguys.net/vbtube_show.php?tubeid=1157
Evil? Hateful? Disgusting? Go ahead and call it that, just make sure you jack off before bed or you'll be up all night stewing over the revulsion-attractive dichotomy which draws guys to this material repeatedly.
Whenever I view male death pics and videos, whether it's here or a fringe news site, and find myself paying close attention to all the details and remain consciously un-aroused, eventually I find myself surprised when I realize my lap is wet, that I've been pre-cumming for however long without knowing. And then I may find I'm still pre-cumming quite a while later when making dinner and my mind isn't on this stuff at all. To the point it can almost become a situational problem.
So death imagery causes the brain and body to begin preparing for sex, even when you're not really viewing it for pornographic reasons.
Blocking out the deep, basic carnal beauty of death and horror probably creates mental problems, compounding one's fears. But embracing it as a normal part of your (and other guys') sexuality is righteous. It makes you free.
I mean it is horribly painful, yet I find the pain of getting my butt burned massively stimulating, sometimes it is the only thing that can get me off. Virtually all of my masturbatory fantasies involve myself getting burnt at the stake nude. I find images of burning at the stake enormously stimulating, and other images of burning and burnt people arousing, but as a vision of myself meeting a fiery ending. 
