"Life is a meaningless coincidence."
A nihilist is someone who rejects an objective meaning to life and in many ways, morality. Nihilists do not necessary belief that acts such as murder, rape, etc. are not immoral actions, but that humans are not inclined to live up to such moral standards. It is also worth noting that nihilists are not neccessary villainous, the actions of many of the villains in this category are not attributable to their nihilistic philosophy, and their actions were not influenced by their nihilistic worldview.