Psychological egoism is the view that humans are always motivate by rational self-interest, even in what seem to be acts of altruism. It can be contrasted both with ethical egoism, which is the view that the individual always ought to be motivated by self-interest and disregard the interests of the community, and rational egoism, which asserts that the rational thing to do in all situations is that which furthers the actor's interests the most. It claims that when sane people choose to help others, it is ultimately because of the personal benefits they themselves expect to obtain, directly or indirectly, from doing so. Psychological egoism is controversial; some see it as an over-simplified interpretation of behavior, others argue that there exists evidence of altruistic behavior.