Definetly the case for me. I was always proud of my kindness to others and almost complete inability to act in aggressive way — right until I finally went into therapy because of depression-like symptoms (I was never diagnosed with full-on clinical depression, so I abstain from using this term). Turns out, stopping your impulses because of your desire to be "nice" and please everyone around you is NOT the most emotionally healthy thing you could do! It's certainly good for others, but not for yourself.
So, now, in therapy, I re-learn exactly the things that these inuit children learn to avoid. At 30, I train to act out, to raise my voice, to listen to my emotions of anger and frustration and giving them a legitimate outlet, instead of pushing them down and letting them rot somewhere inside (often breaking out in awful passive-agressive ways that I don't even notice).
I don't think you're learning to express your anger the way a 2 year old impulsively would.