Yes, the Witnesses are in a public place. Yes, the guy has a right to film. I would agree he was not confrontational in his manner of questioning. I do think however that many people would feel some apprehension about being filmed in this way. I am not surprised that the reaction is that there must be an agenda to why they are being filmed. I am therefore not surprised at all that the response was to move on. Witnesses are constantly told not to engage with those whose purpose is to criticise and very few are really capable of handing direct questioning and reasoning even when it is done in a calm manner. I would be interested know how much more time he could have spent talking with the Witnesses with no camera.
The persecution complex is strong in this one....