This bit was a full-on revelation about the human condition and also about what bugs me with respect to You've Got Mail.

"Because they are both aware of the depths of their own capacity for cruelty, and because they have reached those depths with one another, Stewart and Sullavan are transformed, and together they can safely abandon cruelty, which alone they could never do. Alone they can never resist their worst impulses; together they sail over them with ease."