I can't even play Monster Hunter because the monsters are too realistic and I feel bad whenever I hunt them down. You find them just minding their own business, beat them up, they run away, chase after them, then you beat them up again and again until they're either too exhausted or dead. Even if you do prefer to capture them, who knows what the guild will decide to do with the hunted monster. They could either get sent to the arenas, imprisoned and brought out for barbaric entertainment, or they get carved up for most of their body parts. There's no option to just let them go.

Elder Dragons are fair game though, they're sentient and are causing chaos and destruction deliberately.