A psychiatrist will help with the mental issues better than the internet could if given all the time in the world.

If you want to read up on abstract justice, I suggest Hobbes, Locke or Rousseau. In one way or another they all claim, in foundational texts for modern western civilization, that the state's duty is to protect society, and in the absence of a functioning state (modern Venezuela may as well be that if it's anything like Russia where the state at a local level is basically indistinguishable from the mob) we revert to natural justice. What you were doing is consistent with the idea of natural rights, including the right to self defense.