I was once gibbing dead marines casually. Then lone marine with smg comes near me and stares at me.
"You're next" i psychic whisper to him as i gut the last remaining corpse. Poor marines droped his gun and ran so fast and so far that i never ever seen him again. Kudos to him for good rp.
![Grin :D](images/smilies/grinning.png)
Other than that uses for gibbing are as follows:
1. Getting rid of light created by corpses.
2. Cleaning up hive from corpses. (And decorating it in gore!)
3. Best anti-predator ability.
4. Makes humans harder to be cloned. Their head often flies god knows where and it's hard to find it in mess of gore. Thus dead marines are more likely to join xenos.
5. Demoralizing enemy. And looking like absolute badass monster.
6. And almost forgot, destroying equipment on dead marines. Dunno about you but i will pester any queen until i'm dead or until she gibs host with SADAR on him.
In conclusion: Everyone who hates gibbing are just demoralized by it too much and are upset that there is lesser chance they will be cloned.