That's right bro. There's also the hand throwing aspect that needs to be taken into account also. Say some scumbag wants to attack you when your in the shiter for your ca$h. With your shirt off your arms will have much greater range of motion to throw hooks and uppercuts to the attacking slab of shit's head. Not only that I've noticed that shirts tend to chafe my pecs when I have to severely kick the shit out of punks.
That's a good point. And considering most Getbiggers are on average 240 pounds with 7% bodyfat, having your shirt off while taking a dump, should act as a detterent for said bathroom mugger, eliminating the need to throw a single punch alltogether. When that dirty, theiving, scoundral kicks in your stall door looking to hold you up, he will immediatley notice your massive pecs and 22 inch arms, then he will turn and run away out of sheer intimidation, leaving you to finish taking your dump in peace.