Player want realistic games - even if it is based on fantasy / fiction. They want do everything they can do in real life- but without any or less consequences (which turns the realism back to unrealistic again). Playing e.g. a shooter where you can not turn on friendly fire and other options that provides realism as in real life on a battle ground, is fantasy / fiction. Same for BDO: You can not attack NPCs and friendly fire does also not exist. You can not destroy every object. For the player it is just satisfaction to be able to attack other player who are level 50+ outside of safe zones.