bruce wayne is the "healthy" persona of bruce / batman duality where he lives as a human being is supposed to in modern society despite his catered living conditions he is still functional
batman is a vigilante that justifies constant criminal behavior with "the greater good", "for gotham" and his non-lethal code of honor, he feeds his violent impulses through batman persona and in real life he would be mentally fucked up beyond any repair if he kept doing vigilante shit while leading a double life