I know this is probably going to come out all wrong... but...
I think that any 'persecution' the witnesses experience is brought on by their own actions, or the directives of the WTBTS. If you get abused going door to door expect it. It would happen to any person going door to door. Some people are just going to react badly. If you are in Malawi and don't have a political party card because the society said not to then you will be persecuted even killed. Its so very, very unfortunate that people are misled in such a manner that it comes down to this but the witnesses do things differently to others thus opening up the doors for the so called persecution.
If the witnesses were like any other christian religon and went about doing outreach projects etc I think they would be treated like any other religon. I don't think they would be persecuted any more then anyone else!