Well, this is exactly the problem. First step is that people say random things just because they reflect the emotions they have at the moment. Second step is that later they sometimes derive logical consequences of what they previously said. Then bad things happen as a result.

Usually there is a boundary; people often have crazy beliefs in far mode, while having quite sensible beliefs in near mode. They can keep talking bullshit as long as it does not concern them directly, but when it becomes personal they can either conveniently forget to apply the bullshit, or have some general excuse such as "but this specific case is different". This can work surprisingly well as long as there is a social norm of not requiring people to actually act on their abstract beliefs.

Nerds usually lack the social skills to follow this strategy (because no one tells them about it explicitly; because applying this strategy to itself means never talking explicitly about it), usually harming themselves as the result, by following the norms that everyone applauds but no one except a few nerds actually follows. Sometimes they harm the others as the result, for example when they take the norm of killing unbelievers literally and become suicidal bombers; while for most of the society the same words in the holy scripture simply mean "boo unbelievers" without any impact on their everyday life.

And then there is the complication that our civilization became too complex and has too many channels where the far-mode beliefs translate into actions without people noticing that the boundary was crossed. For example, a person holding a stupid belief in far mode could never directly act upon the belief, but they might still vote according to the belief -- and then the politician in the office might actually do it.

It is a useful tool of propaganda to channel these emotions into far-mode beliefs that benefit some specific group. For example, any kind of frustration with various failures in coordination problems (what SSC readers would call "Moloch") can be channeled into hate against "Jews" or "capitalism" or "decadent western civilization", which can in turn influence the political orientation of people.