Management is a skill like any other. Very few people are born competent managers but most people can be trained as such. The trouble is that most organizations promote their top individual contributors to management without giving them additional training. You'll see a lot of snarky comments on HN about MBA programs but the good ones do instill at least some basic level of competence.

Of course training alone is insufficient. The organizational culture and incentives also have to be aligned. The US military puts a major focus on training officers to be effective leaders, and yet the results have been mixed. Toxic leadership is one of the main problems driving their current retention crisis.