As in hellfire. When a wealthy individual, having rapaciously climbed the ladders of success to get to the top, feels pangs of guilt for the unethical deeds done along the way to get there. Fearing a legacy of scorn, or, if a believer, an eternity of damnation, he or she takes out "fire insurance" in the form of donations to charity and / or public displays of contrition at speaking events, etc.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.