My question is: Why don't all atheist consider themselves agnostic?
I'm an atheist in regards to many particular gods (IE: the God described in a literally-interpreted Bible, the Greek/Norse pantheons, etc.), but an agnostic overall. In other words, I can say as positively as I can say anything that the biblical God doesn't exist, but I can't say with certainty that
no gods exist.
Relating that to your question, another possibility may be that so many people define their viewpoint based on a particular god/set of gods. It's easier to think of religion only in terms of Christianity at times when you live in a region where it is so predominant as where I live, for example. I call myself an atheist, generally, as it generates the least confusion.
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