In the past, I've found these studies often conflate 'atheist' with 'not very religious', using measurements like church attendance instead of identifying as atheist. Is this one of those? Because a more rigorous sorting has produced vastly different results in other studies.
If they are talking actual atheists, I would imagine that not thinking they'll go to hell if they commit suicide would be a factor. A higher suicide rate doesn't bother me nearly as much as a higher murder rate would; but theists tend not to count murdering more people as a mark against the mental health of their side.
If they are talking actual atheists, I would imagine that not thinking they'll go to hell if they commit suicide would be a factor. A higher suicide rate doesn't bother me nearly as much as a higher murder rate would; but theists tend not to count murdering more people as a mark against the mental health of their side.