Know how to use advantage in rugby games. Know and understand why you must play to the whistle.
To encourage attacking play and to prevent teams from benefitting by breaking the rules.
If one team breaks the rules, play normally stops and some form of penalty is given against that team.
In some cases that may hurt the opposing team.
Say one team breaks the rules but the other team is in a good position and is about to score a try. It would be unfair to the attacking team to stop play at that point. It would prevent them from scoring.
To take care of this situation and even extend it, the match official may allow play to continue even after the rules have clearly been broken.
When the rules are broken, the match official...
So remember, even if the rules are broken...