Quote
Anyone else just let it happen and move on?

I did. My DS went through a period of rage and frustration related to justice/fairness (just about on a daily basis) and no matter the intervention employed it made no difference to the outcome. It was so bad at one point that he had counselling and still it made no difference. So eventually I let him have his meltdown without intervening, either he would go to his room or I would just listen. I often thought at the time that allowing him to vent his feelings this way reduced the meltdown time and he was far more settled and at peace with himself afterwards. He eventually grew/matured out of it at about 10 or 11 with no obvious ill effects.

BTW, he has become a very calm and rational teenager, to the point that I can't remember the last time he lost his temper or raised his voice, even when his sister tries to "push his buttons"!!!