[jolmg]

It's probably more that one person understands their own views better than they do those of others, regardless of the particular views of each. Meaning, they perceive the other's views as simple and their own as complex.

A leftist can equally say that a rightist likes simple stories ("if the poor want to be rich, they should just apply themselves", "less developed countries are such because their race (DNA) results in inferior IQ"). The left tends to like complex explanations ("we don't live in a perfect meritocracy for one to just apply themselves. There's various complex societal issues preventing that stemming from racism, sexism, inherited trauma, classism, differing values from working-class cultures, etc. Some of it can be seen as maybe unintended but real covert oppression by the upper classes, which leads to a sense of societal responsibility instead of just simple surface compassion.", "Countries may be less developed because of a plethora of reasons, including historical events that lead to different issues and compounding effects, cultures that value other things over those that lead to personal economic growth (e.g. people that couldn't imagine leaving their aging parents to care for themselves or be left with strangers instead of personally becoming their caregivers), etc. Intelligence doesn't exist on a one-dimensional spectrum as measured by IQ. IQ itself probably doesn't only depend on DNA. It's possible your environment and personal history also influence it. If the belief comes from statistical reports on the average IQ by country, it's also possible it's due to brain drain from emigration.")