The real reason why they are banned: Because the majority of the parliament wanted it that way and voted for the rule. I don't get the outrage at all, why shouldn't the parliament get to decide how they run their own sessions?
The tyranny of the majority is a major detractor of democracy.
Not quite the majority of parliament - it's the 'Ältestenrat', the 'Council of Elders' composed of representatives from the different political fractions that decides on these procedural rules. So perhaps about 15 people for a majority?
Why shouldn't the minority that didn't support the rule get to ridicule it?