Yes. There’s no reason for Bush-bashers to choose between the two.

…Can a false statement be a lie if the speaker is unaware it is a lie?… Why is the speaker unaware that his statement is a lie? In Bush’s case, the answer is painfully obvious. It’s because Bush is a functionally not-bright man. As Chatterbox has explained elsewhere, it’s impossible to tell—and, ultimately, of little interest—whether Bush lacks the necessary mental equipment, or whether he’s simply incurious. The end result is the same. Even Bush’s allies concede that Bush is strikingly ignorant. In the July Vanity Fair, Sam Tanenhaus quoted Richard Perle as saying that when he first met Bush, it was “clear” that “he didn’t know very much.” Perle went on to argue (with what he failed to recognize as condescension) that Bush is an eager pupil. But there isn’t much evidence to support even that.

It’s often said that Bush has the virtue of self-awareness, that he knows what he doesn’t know. That’s probably true. But if it is true, then Bush really oughtn’t to go around making sweeping statements that he hasn’t made any effort to verify. When these statements turn out to be untrue, Bush’s feigned certainty alone justifies calling these statements lies. — Timothy Noah, Slate chatterbox