Augustus
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But most of our actions or beliefs are far from rational. We are still the emotional animals we were 20,000 years ago. We rationalize our behaviour after the fact more than we think about it before.
Why is that so?
We evolved to survive and reproduce, not to strive towards some arbitrary goal of understanding 'objective truth' just for the sake of it.
Why do religious people especially (but not exclusively) try to convince themselves (and others) that their beliefs are rational when they clearly aren't? Wouldn't it be more honest and easier to admit that it's not rational and denounce the societal pressure that everything has to be rational?
It is a hangover of the Reformation that people seek to justify religion in terms of rationality. Completely unnecessary imo.
Are any belief systems rational to the extent that they don't rely on us accepting some subjective, unproven, and often downright false axioms in order for them to make sense?
In such situations reason requires some foundations on which to build, but these foundations are value preferences rather than objective truths.
As we saw from the Enlightenment, some 'rational' ideologies followed a liberal, humanistic path and others were decidedly illiberal (although humanists tend to like to forget about the latter when they preach 'enlightenment values').
Even something as innocent sounding as 'progress' has been responsible for tens of millions of deaths (if not hundreds).