Enemies have different wants and needs to hirelings. You’re invading their home, killing their compatriots, and looting their stuff. Their drive to push you back and out of their territory - or to defend themselves - is what makes them Enemies. Conversely, hirelings are driven by the desire to a) earn silver and b) survive so that they can earn more silver. They’re not the same (and none of the dungeon denizens in the game is human, either), and so they work differently.
But, as I said, feel free to run it however you please. The rules text represents the way I run the game, and you’re welcome to change it as you see fit.