What to do?

My BIL used to be an educated, logical person. He's been to college and retired just a couple years ago.

Ever since 2006, he has been acting more and more strange. He hates Obama and everything he does, believes that the bankers are the good guys, and so on.

Last night, while we were at his place, he admitted that he loves Glen Beck and has recorded every show he ever had on Fox. Now we know What is wrong with him, but I'm at a loss as what to do.

Should we do an intervention and block all access to Fox News? Jam his head in the toilet and flush hoping it will clean out the crap?

Or is the loss of so many brain cells irreversible? He watches the right wing preachers as well so maybe a de-conversion with a hairdryer might be needed?

Is there any hope, or once you lose your mind, you can't find it again?