The Careers are written as victims. Katniss doesn't feel the same sympathy for them as she does for the young or crippled tributes, but she does still hate seeing them get killed, especially in the second book.

They're written as "evil" partly because it's a YA book and those types of books still deal with issues of black and white morality. But yeah, raising a child to murder other kids would warp them just a bit. Of course they're not be as innocent as, say, Rue or even Katniss. You can't honestly think that's not the case.

But the organ meat, that always bothered me, too. It's like Collins didn't even bother learning about the nutritional value of what her characters were so desperate to have.