I think it goes beyond neutrality, or curiosity. Some seem to have a rather urgent drive towards it. In this case it seems like there's a sexual element as well.
Aside from the vehement distaste I feel towards these abominations, they're also fascinating, in that they seem alien to me.
How does one come about? Does it feel and think as I do? How different is its experience of the world as compared to mine? Is it different on the same level as the hypothetical difference in perception between the sexes? Or is it further removed—as the perception of the world would be different for a bat, say.
Does it have a purpose in nature to perform some kind of function? Or is it a failed experimentation (mutation) on nature's part; over-optimizing certain things leading to "unintentional" suboptimization of other things? Or has it more to do with nurture rather than nature?
The fascination is directly proportional to how hard it is to comprehend this.