The real problem, I find, is not new drivers cocking up - do this too badly too often and they're not around for long, and you can easily outpace them anyway - but experienced drivers becoming arrogant and belligerent.
I find, countless times, that the Silver drivers in Race 3 have a nicer attitude than some of the Gold or Platinum racers. This is not a generalisation against higher-licenced drivers, some of the most gentlemanly racers I know hold Platinum licences or even Titanium. What I am saying, though, is that a driver who is being particularly impatient or aggressive seems to be likely to hold a higher licence.
It's not a lack of skill, in most cases quite the reverse, but perhaps an unwillingness to remember that not everybody drives a GTR car, not everybody has done hundreds of laps of the circuit, and therefore not everybody can be as fast. I know how frustrating it is to be stuck behind someone when you know you could be cutting further up the field if they'd just get out of your way, but that doesn't give you licence to make an overly aggressive move or push them too hard and too close.
Sure, we can all make mistakes when following someone, and maybe even take them out as a result. It happens. The problem I find with some more experienced drivers is the apparent belief that because the slower driver was holding them up, it's the slower driver's fault the incident occured. This is probably fuelled by the desire for more points, as they get harder to come by and less meaningful higher up the licence tiers, but it's simply not true.
However, I can never accuse the CTRA admins of any bias due to licence status: the understanding that however many points you have, you can still do stupid things, is definitely there in the report handling process.
Just my thoughts.
Sam