In his email to Andrew Sullivan, Cooper offered several explanations, which I find inadequate.
"Since I started as a reporter in war zones 20 years ago, I've often found myself in some very dangerous places. For my safety and the safety of those I work with, I try to blend in as much as possible, and prefer to stick to my job of telling other people’s stories, and not my own. I have found that sometimes the less an interview subject knows about me, the better I can safely and effectively do my job as a journalist."
This may have been true at one time, but Cooper doesn't do much traveling to dangerous places noways. Further:
"I did not address my sexual orientation in the memoir I wrote several years ago because it was a book focused on war, disasters, loss and survival. I didn't set out to write about other aspects of my life."
I call bullshit.
For a similar response, more diplomatically expressed, see: http://www.nytimes.com/2012/07/04/opinion/a-closet-by-another-name.html