When a person slaughters an animal, he may feel arrogant because he has the power to kill. Throwing the stones in Minaa is an action of power and aggression. Rising to a high place is another act that may cause arrogance in the heart. By applying this sunnah, one controls himself and remembers that Allaah is greater and higher. Likewise, celebrations are occasions of rejoice and happiness.
People tend then to be arrogant.
See as-Saheeah no. 170 by al-Albaanee. Also, people join together in takbeers that are usually full of innovated additions.