1. It cannot, technically! It mimics the speech of its victims, not unlike a particularly murderous parrot, but doesn't have an interest in speaking otherwise. The Goatman is very much a being that specializes in being there just enough to not arouse too much suspicion, so it may seem to have moments of coherent conversation for that sake, but it's not as if you can ask for its life story. As for victims, as long as it gets one, it doesn't matter if they're willing or not. Feel free to feed the beast.

2. Just characters in the game -- or in this case, on the TDM. There'll be plenty of time for the ghosts of his past to come back and haunt him later.