I think that it was important for the authors of the Constitution to create the bill of rights because before when the people that moved from England to the U.S. they honestly needed that bill of rights because everyone was used to just submitting to the monarchy either the queen and/or the king. Therefore the bill of rights was made to lay down the guidelines as to what is constitutionally right and what is not.
Hope this helps you with whatever you were trying to figure out.