I used to bang my head when I was frustrated. I still do occasionally. I've also self-harmed in other ways, both obvious and more abstract.
When your frustration comes in litres and your coping abilities are intended for millilitres there's bound to be times your bucket overflows.
_________________
The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command.
If you're not careful, the newspapers will have you hating the people who are being oppressed, and loving the people who are doing the oppressing. —Malcolm X
Just a reminder: under international law, an occupying power has no right of self-defense, and those who are occupied have the right and duty to liberate themselves by any means possible.