Well here's one theory. People who push the envelop within entertainment are often seen by many as being brave or bold because of a role they've chosen to take on or an idea they wish to express within their art. In many cases, these same "brave" and "bold" choices are viewed by others as offensive and distasteful or even downright sinful. But gradually such offensive ideas have become commonplace so that what pushes the envelop today is far different from what pushed the envelop historically.

Within the context of the media, there are still lines left to be crossed. The public is constantly demanding for those boundaries to be changed however, and for various reasons. The result is that what was once considered inappropriate to be shown on a public broadcast or writen in a public forum is now accepted and bordering on normal. What was once considered a "brave" or "bold" choice is now standard or even restrained. The public again requires somebody "brave" or "bold" to reveal to them that which they now crave, which in the context of the song would appear to be even more bloodshed, more suffering, more tragedy, and ultimately more death. Until that craving is satisfied, they will not pause in their demands for more.

One could even view the terms "brave" and "bold" cynically to the effect that the person pushing the envelop is not neccessarily one or the other, but rather they're simply brash enough to cross the line of current acceptability without even considering that maybe it's not really worth doing. If what people really want is to see other people suffer, is it truly a brave or bold choice to cater to that desire. Or is it the case that somebody's eventually going to be inconsiderate enough to do it even though it means exploiting another human being's pain to do so.

So as the lyric goes: Neither the brave nor bold will write us the stories, so we won't give pause until the blood is flowing.

In other words, the bloodlusting public will not relent in demanding more new tragedy be revealed to them until somebody brave enough and bold enough (or brash enough) does so.