The idea of punishment is nothing new in human community and its purpose is to deter misconduct in society.
The idea of punishment is nothing new to us and its main objective is to deter misconduct in society.The principal argument in favour of removingexpelling students is that it sets an example for others.
... "remove" is wrong here because it does not apply to a situation like this.
The principal argument in favour of removing students is that it sets an example for others. As evident from human behaviour the fear of punishment is more effective in restraining culprits. To illustrate this, Saudi Arabia is a country that verdicts death penalty when someone is found possessing drugs. Therefore, ratio of drug related crimes in the country is almost 0%. Contrarily, most Western countries, besides having effective law and order system, are now considering alternate ways of dealing with this curse, such as according to a recent report UK is considering establishment of areas where addicts will be free to use drugs. This case clearly shows that generally strict penalties keep people away from crimes. Hence, in some societies students are forced to leave schools on account of misbehave.
... you are very correct... So, sometimes hard punishments are more than fine :D