In my area some of the SA workers are fulfilling their community servicce sentences handed down by the courts.
Could be an explanation to some of the not so polite workers.
I do recall a time when all the workers were very pleasant, that is not the case anymore ( at least in my community) but I refuse to let a SA worker/volunteer factor in my decisions of where I am going to shop, if I am going to donate, or how much I will donate.
I do not contribute my time unlike the many of you have stated. I commend each and every one of you as it you that makes differences in the lives of others which effects us all.