Yes, anger is one of the hardest feelings to let go, imo. It intertwines so heavily with the ego that it feels like losing a great battle to give up the anger while it’s overpowering me. I think meditation can be a great help to people who become overwhelmed by feelings of anger. Meditation teaches us to be aware of our body and our connection to it (example: doing a buddhist body scan throughout the day helped me notice that when I’m stressed, I tend to hold tension in my upper back and forehead). I think we can use the “rage energy” in a constructive manner, though, if we choose to. We can turn that energy into whatever we wish – it is purely energy after all.