Fact: a sign of PTSD is not caring about people. Why? Because after getting kicked enough times and seeing others kicked too, you have to stop caring. For the sake of your own survival, you cannot care about every little horror befalling you or other people.
The big problem, though, is that after surviving enough BS you get used to surviving. And that influences the way people you meet (even after transition) treat you. It's a vicious circle. And many of us have problems breaking it.
I know that I was numb for a long time, and it took years for the numbness to dissipate.
I find that I am distressed at the pain others are suffering, no matter the reason. My own defense against that distress is a rather macabre sense of humor, under certain circumstances. It comes out, when the unpleasant consequences, of some act, end up biting the perpetrator.
Some examples:
1. The protestor sitting on the railroad tracks, trying to block the train. Of course, the train could not stop in time. This is the source of some really macabre jokes, because the protestor brought this on himself, by sitting on the tracks.
2. The would-be robber that tried to rob a gun store, when there was a sheriff's car parked in front, and the shop was located in Washington state, one of the first states to have shall issue concealed weapons licensing. Of course, the robber got shot by the store owner, the deputy and the customers. He did qualify for a Darwin Award.
3. The idiot that tried to detonate an M-80 firecracker in his mouth. Needless to say, he also earned a Darwin Award, for his stupidity.
In these cases, I have a lot of trouble feeling any sympathy.