8 years ago
I don't think any emotional output is wasted on humans (or anything, really) when it comes to Xenos. Bears don't hate fish or think of them as an awesome thing to kill - they would be fine with berries or shit from your car. I don't look at my ham sandwich and think, "Hm, what smug little bastard, I should just eat the shit out of him." As devious as ham sandwiches are (and they ARE mischevious assholes), I just eat the sandwich and get on with my life.
Likewise, Xenos don't think about anything when they collect hosts. They just do it.
Though a strong case can be made for Giger's drone actually enjoying rape.