If there is a Cavern of Ultimate Evil and absolutely no story incentive to go and disrupt the monsters who live there, then surely it would be up to the player whether they went. If you do not like being able to fight and fight and fight, then simply stay away.
The game goal is about having fun. Some people really like the tactical aspect of fights and want more of them. Those who do not want this, could just ignore the dungeon and let those who DO enjoy it have their fun with it.
No such luck on the Internet though, where haters will hate on the enjoyment of others.
