Ask a cop.
We're not talking about ogres or hill giants or even mid-level heroes. We're talking about a lone militia crossbowman being unable to take down a single, low-level, unarmored foe before that foe rushes up and beats his brains out. That's how the scene will play out EVERY GODDAMN TIME, without fail, without any interjection of random chance.
The established "game reality" is that the crossbow is the single most powerful Simple ranged weapon that a militiaman can get his hands on. In the previous established reality, it made perfect sense, not only from a game mechanics standpoint, but also in the way that it meshed with our own reality (verisimilitude). Most towns don't have the luxury of trained fighters with two feats to spend on Point Blank and Rapid Shot or-- worse yet-- multiple attacks by way of BAB or Manyshot.
Wulf