If, for example, terrorism almost never happens, it's really hard to judge the efficacy of counter-terrorist measures. This is why you keep sacrificing virgins, and why your unicorn defenses are working just great.
テロがほとんど起きなければ テロ対策の有効性を 判断するのはとても困難でしょう これが儀式でいけにえを捧げる習慣が続いたり 突拍子もない責任転嫁がまかり通る理由です