I haven't seen Bowling for Columbine, so I can't comment on the film. However, if what Grunherz says about the cartoon is a fact, that it portrays whites as the only slave owners, then that is a lie.
There were at least 300 black plantation owners in the anti-bellum South. They were wealthy families and free men. I don't know how the system was back then for slave owning. But it must not have been based on race, otherwise how could there be black plantation owners?
There certainly is more to the slavery question than meets the eye. It is complex, like all important things are. It should be better researched before showing cartoons and ridiculing a "race" for imprisoning another race. Don't you think?
Les