They are literally told this by the most coward person in the whole series, and a few chapters later he shows Hyogoro telling the samurai that if they are afraid of dying because of Kaido's clouds disappearing and Onigashima crashing down and all the samurai ARE HAPPY THAT THEY COULD DIE FOR WANO IF IT MEANS THEIR FAMILIES WILL BE FREE. It is portrayed as a good mindset my dude!