[/QUOTE]You are mistaken. If that were the case, the overhead bins would be large enough to allow each traveler to do so. They are not, so there is obviously no "right" to put a bag into the overhead.[/QUOTE]
Can you point to something in the contract of carriage that says a passenger can put one rollaboard in the overhead compartment but cannot put one smaller bag in the overhead? Or are you instead just making up a rule that you think should exist, but which in fact does not exist?