Bismarck was a risk taker and a his decisions were controversial as he disliked the influence traditional morality had when people made decisions. He could be even called politically amoral. But he understood the need to shape the public opinion on his ideas as he needed support of the people therefore he manipulated public opinion through corrupt journalists and through the printed materials in general.
Southerners approved the Dred Scott decision believing Congress had no right to prohibit slavery in the territories. Later, in 1868, the Fourteenth Amendment overturned the Dred Scott decision by granting citizenship to all those born in the United States, regardless of color.