Rosa Parks is a civil rights icon. She is an incredibly important person in American history. But artists have always had freedom of expression in the United States. In order to remain the free country we believe ourselves to be, we must allow that freedom of expression to continue. Instead of suing Outkast for defamation, it would have been more useful to write a review indicating why their "Rosa Parks" was undeserving of the name. Entertainers are not historians, and songs are not defamation--even if we don't like what they have to say.
I understand if Rosa Parks was upset about the use of her name in an Outkast song, but she became a public figure still speaking out against racial discrimination. Given that is the case, it was perfectly okay for a group to use her name in a song, as long as they weren't defaming her.
No, we do not take name usage in media too seriously. I feel that each person in the community, most notably those that do not want fame , should have a say in whether or not their names are used as the subject or content of a song. Depending on the context of the entertainment platform, this could hurt an individual's reputation or bring about unwanted attention. In addition, one could argue that this is an invasion of privacy.
No, we do not take the usage of names in entertainment too seriously. Rap music, however, can present some controversial messages than some people do not want their names attached too. Rosa Parks may have been especially offended by the message of the rap song to which her name was attached.