Well, the trick is to treat the posts as if they are going to appear in a 1920s or 1930s pulp magazine. That is the danger and wickedness is touched enough upon to give a certain sense and feeling, but in no ways is gratuitess violence graphically portrayed. Tantalize and allow the imagination to fly without giving explicit details that would get censored. A lot of horridness usually happens 'off-screen' or by something in the shadows.
As for the characters, they can be true heroes, but there is rarely a law abiding authority figure they can turn to. The politicians, guards, merchants, diplomats, and so on are usually decadent and corrupt so the PCs in such a world might decide upon their own code of conduct in order to survive. Such men might behave differently in a more ethical society.