I'm not sure why you find "fantasizing about being a victim" so hard to grasp. It's incredibly common and spans across a variety of fetishes. The feeling of having power taken away, of being at the mercy of someone else, is something a lot of people find extremely erotic. The cliche of the high-powered businessman (or businesswoman) who after work goes to a dungeon to be tied up and have nipple clamps applied by someone who calls them "slave" and forces them to lick their feet exists for a reason.
From bondage to ageplay, a lot of fetishes involve the notion of one participant being an unwilling victim at some level. That's not what makes it work for everyone who has that fetish, but for some people it's going to be the main draw. Roleplaying, in many fetishes, is often an aspect of pretending that what's happening is closer to the unattainable reality (rape, slave relationships, authority figure relationships) than it actually is.
As for the "wired in the brain" part, the significance is it's something the person links to sex, even if it's not directly sexual, and which heightens sexual pleasure for them, and (most of all) is involuntary.
Of course, nobody but yourself can really be sure why the concept bothers you so much.
From bondage to ageplay, a lot of fetishes involve the notion of one participant being an unwilling victim at some level. That's not what makes it work for everyone who has that fetish, but for some people it's going to be the main draw. Roleplaying, in many fetishes, is often an aspect of pretending that what's happening is closer to the unattainable reality (rape, slave relationships, authority figure relationships) than it actually is.
As for the "wired in the brain" part, the significance is it's something the person links to sex, even if it's not directly sexual, and which heightens sexual pleasure for them, and (most of all) is involuntary.
Of course, nobody but yourself can really be sure why the concept bothers you so much.