Dak
mentat
It's not my made up definition, but nice try.
https://dictionary.cambridge.org/us/dictionary/english/rationality
A person can be rational. A statement can be logical. A person can be rational whilst disagreeing with a logical statement.
In the case of the bombings, let's think of it this way:
"In my experience, many people who send bombs in the mail get arrested or worse. This being the case, it seems like a risky idea to send bombs in the mail."
While a logical construction might be:
a) bombs kill people
b) liberals should die
c) I should send bombs to liberals
No, you would call the construction logical. Rationality describes a person's ability to navigate logical statements based on prior knowledge.
The definition at cambridge refers to being reasonable, or possessing reason.
https://www.merriam-webster.com/dictionary/reason
https://dictionary.cambridge.org/us/dictionary/english/reason
Webster's definitions of reason and rationality lean on logic whereas Cambridge doesn't necessarily. Interesting difference. You're correct that a knowledge base would partially determine a person's rationality. So would their values base.
https://en.wikipedia.org/wiki/Logic_and_rationality[/QUOTE]
Well, truth and falsity have to come into play at some point, and it's not unrelated to the question of outcomes. A perfectly logical statement can be false, and someone operating under such false (yet logical) pretenses would likely invite undesirable outcomes. A rational person would be able to reflect on this and correct their behavior. An irrational, or even mentally ill, person can still be highly logical (just look at John Nash).
We have to apply our capacity for rationality to logical statements in order to ascertain their usefulness. So some hypothetical bomber might very well operate under a logic in which it makes sense to send bombs through the mail, but rationality would intercept this logic and apply to it the bomber's previous knowledge of the world. For instance, would sending bombs in the mail be socially acceptable? Are apprehended bombers usually set free? Do bomb plots through the mail usually achieve the desired outcome?
If the bomber's intention was merely to troll the media or something like that, why choose such a legally and physically dangerous operation? Why not merely email bomb threats to the CNN offices? Or why not send in fake tips about conservative witch covens in the basements of the Hamptons? Furthermore, if the bomber doesn't care about getting caught, or in fact wants to be caught, then why play cat and mouse? If the bomber needs a game of cat and mouse in order to experience some thrills, that's a sign of an imbalanced mind (although not quite mental illness, necessarily).
If it turns out the bombs are fake, the bomber has still committed crimes. If it's an attempt to secure some short-term thrills, that's not rational considering the potential long-term consequences. There's just nothing that's rationally airtight about the act itself, although the bomber's reasons for doing so might be logical.
You're making a great argument as to why if you were to send bombs through the mail, this would be irrational. You cannot project your knowledge and values onto some unknown person and then deem them irrational.