I think punishment for school rules is an important part of school discipline, but there are always exceptions to each rule.  Students might find punishment suspended under extenuating circumstances.  For instance, it is usually a rule that students cannot leave the classroom without permission.  Most students are asked to carry a pass or a note to prove they have permission to be out of the classroom.  There were certainly instances where a student left my class or was found and was not punished.  Usually this was due to illness or other extenuating circumstance.  

If a student were to break the rules accidentally, maybe that student should not be punished but should instead be given advice and be informed of what the rules are. 

For instance, if a student wears a hat to school during his first year at the school and doesn't know this is against the dress code, perhaps he should not be punished. 

Also, if there are circumstances outside of the student's control which lead that student to break the rules he or she may not really deserve punishment. An example would be if a family's car has broken down and the student is forced to take public transit to school and the earliest available bus gets the student to school late every day, it might be appropriate to choose against punishment. 

While you'll have trouble arguing that some kind of punishment is not necessary for those who break rules, you could certainly say that positive consequences for good behavior is probably a more effective approach than negative consequences for bad behavior. I am no expert, but have seen evidence for that sort of thing cited again and again in staff development workshops.

You said that students who "give the suggestion or advice" should not be punished.  Is this all they are doing to break school rules?  What if they do something that is a greater violation of school rules, such as cheating on a test or cursing a teacher?  Please let us know about this.

If you have to argue that punishment is wrong, you could say that students do not learn from it.  You can say that the kinds of punishments that are given do not make students learn to be more obedient or self-disciplined.  Therefore, it is pointless to punish the students.