I disagree. Just because there is a 'good reason' that people are uninformed doesn't make them any less a useful idiot. If you haven't figured out by now that you aren't going to get unbiased information from media (conservative or otherwise), then you are a useful idiot.
Heck, everybody's got a 'good reason' for their ignorance. Only those who make the effort to educate themselves can escape being useful idiots.
In short, just because you have a 'good excuse' for being a useful idiot doesn't make you any less a useful idiot.