I think it is the “love is blind” cliche or “love is for children” cliche I have come across as applied to sexual love.
People who believe “Love is Naive” see love as weakness in a world that is filled with evil, a world within which in their opinion, “nice guys finish last”. I dare say you probably have come across the “nice guys finish last” cliche, a cliche that merely is another rendition of “love is naive”.
I actually have come across articles promoting selfishness in one form or the other as requirement for success in life.
It is important to note that self interest is not the same thing as selfishness. We can care about our self interest without acting selfishly. When people act selfishly they do not care about effects of their actions on others, meaning they can justify actions harmful to others.
Consider this. Whenever a bipartisan vote serves to enhance welfare of the polity but politicians vote on party lines, selfishness militates against a bipartisan love outcome. Americans voted for Trump partly with the hope an outsider as President could help break the partisan deadlock in American politics. It appears the idea might be working perhaps not in the manner envisaged by the people — think numerous defeats of repeal of the health bill, defeats facilitated by Trumps' republicans, that is by voting of some Republicans with Democrats.