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Even a generally rational character might have issues that cause them to snap and act irrationally. For example, in Star Trek TOS, in the episode with the Horta, Spock (the epitome of rationality) ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/35752 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/35752 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
**Even a generally rational character might have issues that cause them to snap and act irrationally.** For example, in Star Trek TOS, in the episode with the Horta, Spock (the epitome of rationality) is all rational and "Captain, we must preserve life, we must attempt to figure out what the creature's motivations are", right until he thinks Kirk might be in danger. Then, suddenly, it's "Jim, shoot it before it attacks you!" However, **you would have to have a good answer for why slavery is the issue that causes your character to snap**. The irrational act would also have to be an emotional act, done in the spur of the moment, **and something the character would chastise themselves for later** , once they've had time to calm down and return to their regular way of thinking. @Amadeus gives a very good answer regarding what the rational thought process should have been.