Capitalism. Specifically, the stock market. IPOs make good companies into bad companies.
Being owned by stockholders effectively removes any amount of “human” in the company’s choices and direction. There becomes a single goal, to which everything else is sacrificed: make stock prices go up in the short term. The C-suite execs will say all sorts of other shit, but any appearance of accountability or altruism is solely geared to making more money at any cost. Any leadership with a soul will be forced to either give up trying to be “good”, or they leave.