I’m not sure if this is the correct answer and hopefully someone will be able to give you the right answer, but i always assumed it was because it was burning you so slowly you don’t realize. Like that old science experiment (totally unethical now) where if you put a frog in a pot of boiling water it would obviously flinch and jump out immediately but if you put a frog in a pot of tap water then put that on a burner to let it boil on the lowest setting, the frog would stay in there until it dies because the temperature is raising so slowly.
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