That is a reason because he or she might make himself appear guilty, that is given to us by the fifth amendment in the United States Constitution. There is countries where criminal get away because they don't have the right to remain silent and suspects dig himself a deeper hole. That is the reason suspects have the right to remain silent. The history of the Miranda Rights are in 1966, the Supreme Court in the United States had a case. Ernesto Miranda was being accused of two crimes which were kidnapping and rape this man was questioned by the police for two hours. Then he confessed to the crimes but when he was in court they could not use any of the evidence they found against him.
Suspects have the right to an attorney when the police are questioning them. The sixth amendment states that we have the right to an attorney even if we don't have one they will provide. Many times the attorney will tell us not to talk. That is why we should be glad we have the right to an attorney because places in the world have rights but they say if you don't have an attorney you don't get