I mean this is how sengoku period was. It's not like other periods. The girls really thought they can put their own ideals in a period where war was too active before Tokugawa Ieyasu ending the sengoku period by becoming the first shogun. Cruel, Evil and saw a lot of bad sides of humanity. There is no way nowdays believe works at the past. Said this before, the episode 1 where Mai was crying still ticking me about what is going to happen at the episode 12