The UK is pretty much a western country and I've yet to meet anyone who supported or even approved of the Vietnam conflict.
My mother was an arch Tory but even she gave money to trade unionists collecting for the North Vietnamese at a fair we went to. She also treated the trade unionists to a tirade about fighting Nazis in the last war and how the Americans were no different in Vietnam. In many ways they were worse because they had long hair and were smoking marijuana.
Like I said she was an arch Tory.
I think it's different in Australia because you also had people fighting over there. We didn't, thanks to Harold Wilson.