Jim ,the term folk police was used in a light hearted manner,it was a joke,..
I am still waiting for evidence of the revivals bad treatment,of source singers,
Jim,your one example of people joining in verses with Walter,is something I would not be happy about either,but it is still miniscule evidence,and has to be seen as part of an overall picture where source singers /musicians,have got on well within the revival.
Mary AND Barbaras attitude indicates to me that if it happened to a source singer[which so far, apparently has not happened]that there would be enough people in the audience to complain to the organiser and a stop would be put to it,but it has never happened.
for people not familiar with the British Folk Revival,I feel it is important it is portrayed correctly and fairly.