Answer:
It seems like Robert Louis Stevenson, the author of "The Strange Case of Dr. Jekyll and Mr. Hyde" meant his story to be ambiguous in many ways, to frame the conflict between "Good & Evil", thus he creates a moral paradox among "Ethical Altruism" and "Ethical Egoism"; ergo one could consider that final decision as both hasty and rational, since it came out of Dr. Jekyll's urgency and despair of preventing further damages, but it was thought-out as well, displaying a line of thinking typical of "Ethical Altruism", which requires logical reasoning.
Step-by-step explanation: