If the SACL had all companies/individuals removed for driving indiscretions, then it'd be a pretty quiet ramp...
Matt, it's one thing that they have a radio on board, but whether, while doing the commentary thing and with all due respect, they choose to properly "listen" to it at any time other than when they cross live taxiways or traverse the western perimeter road is another matter. It's easy to zone out from what's being said, especially if there's a lot of standard radio traffic being broadcast.
And also, highly trained/versed or not, people make mistakes. Making an error is one thing, but repeating that error over and over would then be a cause for concern.