
Originally Posted by
Satan_Klaus
Certainly true, but most blakmail fiction is set in the supposedly "real" world. Therefore many rules are already set because the reader knows something about the workings of the real world. In a purely fictional world anything goes.
In a world that deviates from ours in small but recognizable ways, the reader can not be sure that every rule that applies here is valid there but it still gives the story a "realistic" feeling because the worlds are so similar.
It is easier for the author to keep up the suspension of disbelief even in "implausible" situation.
Satan_Klaus