Because pointing out that a slogan is simple and in-nuanced is unhelpful, and in bad faith. They're supposed to be simple. Slogans in a democracy are calls to a

Because pointing out that a slogan is simple and in-nuanced is unhelpful, and in bad faith. They're supposed to be simple. Slogans in a democracy are calls to action towards a general idea, and the more complicated they are the less people they can rally. Obviously the nuance will come when lawmakers actually put the thing into writing.