Anger is not power to make change, it's energy to get you moving.
For example, a boss might yell at his employees and think the anger was the power that got them working, but actually if the boss doesn't pay the employees, the anger is completely ignored. The money is the power, not the anger.
In spousal relationships it's even more damaging: the anger isn't the power to make change. The change happens because the partner actually cares about the other and wants her to not be angry. As soon as the partner stops caring, the anger is completely ignored (as shown in many videos of divorce proceedings).
Confusing anger and power is a problem.