lynching is the act of a mob prosecuting a person or punishing a person without the consent of law.
The people who are lynching have the thought process of kill the prosecuter or beat them up really bad, they feel adrenaline and the need to lay the law down themselves. after a lynching the mob typically ends up being ashamed of themselves and they all feel guilty, it depends on who the mob is though-gangs seek revenge, kkk seeks darkness, and mafia- well they seek money and power.
Yes they can go to far if it goes way to far then yes government should get involved otherwise people should try to resolve the problem with out the government