Sometimes it is necessary to cite a source of (tell the location of) bad information or a myth so we can, in the biography or research notes, write about why it is bad information or a myth and present other sources to support our conclusion. Source citations tell WHERE the information (even bad information) is located; it is our writing in the biography or research notes which tells about the reliability or accuracy of the source. If all we do is cite the source without telling what information it included and evaluating its information and reliability, then, yes, that would not be good practice. But if we cite a source, then discuss the information and the reliability, we have done absolutely nothing wrong.