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Rationality is certainly not defined by your society's sense of morals. And if you think mass shooters do it for no reason, you are fatally misunderstanding.
Rationality is the quality or state of being agreeable to reason. The idea of committing mass homicide is not reasonable and anyone that could come to the conclusion that it is an answer to any question is being irrational. What I should have said was no "good" reason. For example if I kill someone who is trying to kill me. I've still killed someone, but with the justifiable reason that I was defending myself with an equal amount of force.