The “boiling frog” is a philosophical postulate in which a frog is brought to gradual familiarity with an environment that slowly becomes lethal. The premise is that this cold-blooded creature will react quickly when placed in boiling water because of the drastic difference in his baseline temperature. But when introduced to a pleasant, tepid bath, his biology will slowly adapt to a gradually changing environment and he will not sense discomfort until it is too late to respond to the now lethal temperature he has been exposed to.
We can’t blame the frog; he isn’t aware of the slow change and impending doom. But we are and, thus, are not free of fault.