I think the Rugby sin-bin had to be introduced because of an unintended consequence of an earlier change. Tries used to be three points plus two for a conversion and penalties/drop goals also three points. Someone had the bright idea of encouraging players to go for tries rather than kick goals by increasing the value of a try to four points and now five. Of course that just encourages players to cheat to stop tries so now we need a sin-bin to stop that..... The way I think about it is that if the punishment for any ofence is much higher than the gain from carrying it out then there won't be any offences. So I would go with harsher punishments every time.
They can send people to the noon and bring them back. So why, in the year 2013, is it still so difficult to police a game of football. The technology is here., ..... lets use it.
Yes SD., Thanks for pointing that out. I seem to have missed placed my testicle's..... Ahhhh !!!, I mean Spectacle's.