Yes, exactly: there is no inherent conflict or contradiction in pushing truth (and especially only parts of it, manipulating by omission or redaction) and having an agenda. There are many ways in which you can manipulate e.g. public perceptions and policy with publishing the "right" truths at the right time.

Though, I am not of the opinion that WikiLeaks has a hidden agenda or is controlled by a third party. But, neither would I be shocked to learn such a thing.