You have to put it into the context of the early 1960s, when the Civil Rights movement and anti-war protests, etc., were gathering momentum. At the time the song (although not the only one of its type) created quite a stir, because of the questions it posed. Maybe nowadays some of the words may mean less than they did then, because things might have moved on in the past 40+ years (though some might say not as much as they would have liked).