When a posting changes topic the Mods etc usually point it out, seems like the Mods are taking part in the change of topic.
Sometimes it's necessary to bring a thread back in line, but as far as I'm aware there's nothing in the rules that says that we have to ensure that every thread has stays rigidly on topic either. Besides, this is in the off topic banter section and people seem to be enjoying a good rant and debate about various topics here (including the original one), so I really don't see there to be a problem.
Now more importantly........... What about those "middle lane hoggers" on the motorway then???