You can't expect freepers and dittoheads to learn anything from DU because that would require them to have the ability to think for themselves and by definition dittoheads can't do that and since most freepers are dittoheads it goes for them to.
One reason liberal talk radio is so hard to find is because we don't need to tune into AM radio everyday to find out what we are supposed to think today.
Emmanuel Kant said it best I think when he answered the question of "what is enlightenment"
IMMANUEL KANT
An Answer to the Question: "What is Enlightenment?"
Konigsberg in Prussia, 30th September, 1784.
Enlightenment is man's emergence from his self-incurred immaturity. Immaturity
is the inability to use one's own understanding without the guidance of another.
This immaturity is self-incurred if its cause is not lack of understanding, but
lack of resolution and courage to use it without the guidance of another. The
motto of enlightenment is therefore: Sapere aude! Have courage to use your own
understanding!
Laziness and cowardice are the reasons why such a large proportion of men, even
when nature has long emancipated them from alien guidance (naturaliter
maiorennes), nevertheless gladly remain immature for life. For the same
reasons, it is all too easy for others to set themselves up as their guardians.
more:
http://eserver.org/philosophy/kant/what-is-enlightenment.txt