In the comments section of the previous post, andrew stated that his grandparents remembered how horrible an atheist state was. There is nothing to prevent an atheist state from being horrible. That would depend on the individual leadership style (or lack thereof). I'd be the first to admit there are genuinely evil atheists. However, there is nothing inherent in being an atheist that guarantees evilness. There is, however, the inherent property of religious leadership that results in discrimination, forcing legislature on constituents based on imaginary friends, or so-called sacred books.
Nothing prevents atheist leadership from being bad, but religious leadership will always be biased to say the least.