Why do we say, "Poor sod/cow/bugger" etc?
Those terms are usually used in a derogatory way, so why do we use them when we're feeling sorry or bad for someone's misfortune?
For emphasis. And a little drama. Somehow saying "poor businessman" doesn't have a down and out tone to it despite the fact he already filed for bankruptcy.
Sod, in this sense, was originally an abbreviation of sodomite, which means exactly the same as bugger originally did...ie it's a reference to homosexuality. By the 1930s it had taken on a 'softer' meaning such as fellow/chap, especially when used in commiseration. Bugger, too, took on the kinder meaning at about the same time. Cow was just adopted as the female equivalent of the two above.