It's a mixture of OOC and IC. Let's address the IC first, since that's the grounds you're arguing this on.
Mmmhmm..I can see how, IC, Big Bad Evil guy has absoloutely no reason to politely take the fight out to the clearing because it's the rules. Be a rebel! Fight in public, start a barroom brawl! And you know what? Ironically, the OOC punishment just about follows the IC rationale. Make a character like that, and he Won't be IC'ly welcomed back, just as readily as he won't be OOC'ly welcomed back. Hence why you shouldn't See people like that in the CRT; they get kicked out. Make a character like that, and you reap what you sow, simple as that. The way around this? Put something into your character's personaility that gives him something but fluff between his ears; Maybe let him realize that...inciting a room full of powerful adventurers is less then wise...Angering the management who control their domain with an iron hand is foolish...And the simple effort of walking out the door means you can slit somebody's throat with a whole lot fewer witnesses. In essence, you're viewing it purely as an OOC thing; take in the IC aspect, add that into your characters rationale, and you'll find it makes a lot more sense to just walk outside from a purely IC perspective, rather then cringing at stretching plausibility by going against the IC.
Say it Is just an innocent barroom brawl..Then once again...IC'ly, you get exactly what you Would earn for such an act; a firm boot out the door. There's no stretch there...It's straightforward, altogether.
Now let's view the OOC-- Ever seen the guy who comes in, throws rocks at everybody, demands attention, interrupts you in the middle of serious conversations, sets the bar on fire, blows up the world, juggles all the tables in the room, and leaves taking the Bargolem, till and all, out the door? That's what fights evolve into. Flashing explosions, big theatrics, all the commonplace things, and if you're rp'ing peacefully in the tavern, you are outright Forced to either ignore this fight through OOC means, stretching plausibility, or respond to it whether you want to or not, and get stuck doing something you probally had no desire to do. You look at it as the room demanding your character to conform OOC...I look it as the rules trying to avoid the need for the room to conform. Rather then your character demanding responses from everybody within the Tavern, you are instead provided with ample choices to fight, where the only people present are those Wishing to view a fight.
For the final point on my rambling, 4AM babble, let's flip the tables. Fight in the Tavern..Why not chat in the Clearing? Would you enjoy carrying on your battle royale while there's an afternoon tea social going on in the corner? Does that make any sense?
In essence...To sum up my completely random, out-of-the-blue post...mmmm...Nah. This is just too poorly written to get a neat little wrap up -.-