Once a leader shows anger or aggression, there is no psychological safety. Trust is 0.
Rebuilding trust is a long road.
There is no place in modern leadership for anger or aggression. Compassion and focus on the person needing the help is essential to building high performance.
If I have feedback, I always ask the team member to think about what they will do differently? What will be the trigger?. I ask them to spend 0 time on ruminating the event as it is emotionally draining and unhelpful. Instead focus on the long term solution.
My tone is always curious, non judgemental and supportive of the learning. I also want to understand what the trigger is for the person, so I can help them in the future.
If you are angry as a leader, reflect on your ego because anger is a reflection of you.