Kenny is closely based on a childhood friend of Parker who was also named Kenny, with whom he shares several attributes; he was the poorest kid in the neighborhood, and would wear a tightly-drawn orange parka that muffled his speech. When developing the character, the show's creators had observed that most groups of childhood friends in small middle-class towns always included "the one poor kid", and decided to portray Kenny in this light. The practice of killing off the character in each of the show's earlier episodes was inspired by events associated with the real-life Kenny's tendency to skip school; noting his absence at the school bus stop, Parker and his other friends would jokingly assume that he had actually died, and then act as if nothing had happened when the character's namesake would re-join them days later to resume attending class.
I don't know exactly, I think mainly cause its funny and totally random. Plus almost every comedy show has what is called an antagonist, who is always the character who gets beat up or has problems, and in South Park Kenny is the antagonist.
Or are you looking for some sort of subliminal/hidden message sort of reason why he always get killed?
BECAUSE HES GAY!!!!!!!!!! AND ITS TRADITION BUT MOSTLY BECAUSE HES GAY!!!!!!!!! DONT HATE ME HES HOT BUT THE LIL BASTARD NEEDS TO LEARN TO SPEAK
posted over a year ago
he knows how to speak, there are a few episodes when he speak with no problem, his speech is muffled becouse of his tight parka but if you listen closely you can hear what he says. If you really wan't to know what he said just google it :)