That explains the nutted solid axle.
You can use a adjustable spanner opened so it just fits over the hanger to straighten it. Remove the derailleur first of course.
The hanger is there to 'save' the frame in the event of accident.
Thank you, it seems it did just that, i guess its just a bit weaker than that part of the frame to take the hit. I assume all that bit of frame is pretty solid