Lazy, impulsive, violent, retarded, thieving, ugly, self absorbed, moronic, superficial, insecure, untrustworthy, and all around vile pack of subhumans. Considering the fact that it is niggers themselves that will receive the bulk of their fellow nigger's niggerdom, and you have a worthless group of pavement apes. Exceptions need not apply, the nigger is generally terrible, everyone knows it and they themselves know it.

tl;dr: Because niggers are subhuman ape garbage and deep down EVERYONE (including niggers themselves) know it. FUCK NIGGERS.