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adrenaline coexist with adrenochrome they are chemically very close together an slight reactions with ph and oxygen change them into each other so if you have one you have the other.
you can get it from fear/excitement or from stimulants or from blood of a kill or torture victim
when the rush wears off empathy is killed
this could be because adrenaline turns off higher brain functions or because fear/excitement is the strongest emotion and biological systems are prone to tolerance/desensitization/addiction
this explains the behavior of jews, chinese, tribes, hunters, the elite, religions/cults, truck drivers, business people, etc.