We are not getting what we want.
We are getting what we don't want.
We got something we wanted and it was taken away, broken, lost, changed, what have you.
All of these reasons make it clear that we are the ones responsible for perpetuating anger and NOT some outside person, situation, force.
If we let go of our desire to have things any other way than the way they are RIGHT NOW, we will no longer suffer.
In other words, resistance is hell.
I find this realization quite liberating.
It's all up to me.