The Return

I has return to this site for the first time in months and will attempt to kept more current in the future.

Just finished a game of Rune Quest (Fantasy role-playing) with an experienced group and managed to kill them all - which was not my goal. This raises an interesting qeustion. As a referee for such a game, should my goal be to make it tough and challenging on the players, or make it fun and fairly easy on the players? I can see arguments for both sides, but have usually taken the "tough and challenging" route.

I would appreciate other opinions.