Just one perspective:

If you take a text considered significant by traditional standards (in my example here, the Aeneid), you can find not only evidence of prejudice, but a subtextual acknowledgement by the author of the existence (and the harm) of this prejudice. It's possible to label this complexity as deconstruction, but in my view, the author is to some degree aware of the necessity of probing the counter-text of what he is expounding.

The Aeneid, from my perspective, is the supreme explication of the tragedy of the whitewashing of history.

There are plenty of examples elsewhere (Euripides' Medea, for example).