Try to view it from a different angle:
Chat channels are often called rooms, let's make a visual situation out of this.
When you join a channel, you enter someone's room. That person, if he/she's not around, gave Godlike access to trusted persons and those persons are in charge of keeping the room clean. Now if that person wants to kick you because he feels like it, that's his right, even if he has no reasons to do so. I doubt the network's IRC operators will get involved in such a situation, no matter how big the channel may be, simply because a channel is a little piece of a network where specific users can act pretty much like they want to (as long as it's allowed by the network).
