I remember Karine Polwart saying on her FB page that when she tried to both explain her position on independence, and to explain how the debate was perhaps not being covered well in the UK media as a whole, to an audience at a festival in England that a big portion of the crowd simply went for a stroll or for a drink. Again people want to be entertained and not lectured to. Different a few sentences in introducing a song but if it is a more detailed preaching to the people then you risk alienating them. She conceded it didn't work!