Poor management practices are largely affected by the function of management as an interface between two inherently incompatible systems; the individual and the organisation.
There is an alienness about each other. An organisation doesn’t have a mind to empathise with the individual and its decisions are often obscured by the regulations of other organisations. The individual (of which there are many and they are varied) has motivations, experiences, feelings, and other stuff going on in their lives that the organisation isn’t aware of but which can affect the individuals work.
The manager is expected to represent the interests of the organisation to ensure its success at the cost of the individual if needs be, but at the same time is expected to care about the individuals they work with in order to represent them to the organisation. Management is an ethical dilemma. I can’t think of any other situation in life where a similar interface exists, so it’s hardly surprising that management practice is not achieving what we might hope for it.