Negative atheism, the abstention from God-belief, is a softened/humbler position than positive atheism which rejects God belief. the latter is claim about reality, the former is a stance in psychology. And, may I suggest, negative atheism as a position is an ATTACK on positive atheism.
Negative atheism essentially says to the positive atheist–you have not given sufficient proof against God’s existence. I cannot ascribe to positive atheism in good conscience/mind since the evidence is too inconclusive to warrant affirming the claim that “God does not exist.”