People in general hate ambiguity and prefer any kind of risk that is not obscure, indeterminate, ambivalent. In other words, the well-specified possibilities are preferred over the uncertain possibilities – even if the well-specified gains are of lower values ​​than the uncertain ones. This bias is irrational and has a name: Ellsberg paradox. This aversion to ambiguity is not unique to men, and the capuchin monkey, for example, alsom prefers options with complete information to options with indeterminate ones. This commonality between man and capuchin monkey shows us that most likely this decision-making process that avoids ambiguity at all costs is not unique to human beings and has evolutionary roots. In the Brazilian political context, the message that remains is the following: extreme opinion can be a mere aversion to ambiguity, a very primitive trait of primates!