That's exactly why I am saying that it is difference in culture man, farmers know how to dispatch animals and they show it to their kids because they might need it in life, it is different in different families, but as far as it seems, when dungeons appeared they caused immense destruction, many people certainly died, monsters from dungeons can and will go outside and kill on sight if there is too many of them in dungeon. Current culture, television, internet and streaming, all formed with long lasting effects of dungeon danger even if it is controlled right now, you think they don't stream the process of team killing monsters, including humanoid ones? They do, that's the whole premise, they watch that violence, and it is important for them, who knows if one day there will emerge more dungeons, what if they will flood out the city or village? You want everyone get into panic and horror seeing all the violence that will ensue? Or you want those who can fight to protect people and said protected people evacuate as fast as possible being used to all those imageries?
Anyway, my main idea here is that you apply our culture as absolute, especially the norms that got formed in the last couple decades, to their world, where exactly those last decades were different due to emergence of dungeons, and later history can form details and very central core, but the recent history is what forms most of the modern culture, norms and believes, it is norm for them