Any scratches found were made by the curtain rods anyway, John. You know the routine.
The leftwing conspiracists seem to have, unlike the rightwingers, some affinity towards Oswald, some need to defend him, a kinship. My guess is that they view him as "on our side" and a victim of the rightwing Cold War militarists. A sort of a leftwing version of the Jewish Alfred Dreyfuss. They have a need to defend him. I don't see that with the rightwing conspiracists.
I think a lot of CT's identify with Oswald, the vast majority of CT's seem to be loners, arrogant, argumentative, hate authority, lie when necessary, paranoid, essentially all the characteristics that personified Oswald and I also think that most CT's genuinely believe that Oswald is innocent and that some day they may be just as "innocent" and accused of a heinous crime, so they feel an overpowering need to defend Oswald because one day they could be the next patsy!
JohnM