ced1106:
I would hope that the lesson of "don't underestimate anyone" is taught in a non-party leathal manner. But once a party gets up to high levels, and they haven't learned their lesson, it's hard to throw enemies at them that WILL beat them, but not have the potential to kill them all. So, for the player's long term benefit (and possibly the DM's) the PC's sometimes have to die.
I would hope that the lesson of "don't underestimate anyone" is taught in a non-party leathal manner. But once a party gets up to high levels, and they haven't learned their lesson, it's hard to throw enemies at them that WILL beat them, but not have the potential to kill them all. So, for the player's long term benefit (and possibly the DM's) the PC's sometimes have to die.