There's a comic arc where Batman tries feverishly to get rid of his fortune not through philanthropy but really by selling and giving away everything. The system is so rigged that he is still stupidly filthy rich by the end of it all and the systemic inequalities and corruption make it so that all his money is being squandered and used to further abuse victims instead of helping. So he ends up beating up people in a black suit anyway, as the only real way to fight corruption.

Also, there's a literal supernatural curse over the city anyways. It will always be evil and corrupt.