Since we all know that niggers are incapable of reason, and act on impulse, it would be absurd to ask; "What would be the top ten reasons that niggers kill?". As erudite niggerologists, however, we can properly frame the question as; "What stimulus is likely to trigger the sub-human shitape's mass of cranial excrement so as elicit a poo-flinging primate response escalated to the level of a category five Chimpout?"

Food
Muh dik
Disrepecked
Skreet cred
Nigglet/Ho won't shut up
Rayciss YT
It beez Friday n sheeeiiit
Misses prison homies
nigga stole my shoes
EBT card empty
Smart nigger syndrome*
Gibsmuhdat failed
Asked for I.D.
Others?

*through some miracle, it realizes that niggers are worthless and has a much compunction about killing niggers as stepping on a turd fly

What other categories would you suggest, and in what order would you rank them, my esteemed fellow niggerologists?