It's ok once they've learnt the track and that because at least they can get round and their driving shouldn't be so scatty you don't have to crap yourself when passing them... It's just when someone joins a race with a track/car combination they have no experience of whatsoever.. that's when bad things happen. I probably should have been more clear, but I'd just had a crap day at work when i wrote that.
Also, it'd help if some people were told what a blue flag meant... there are a lot of people who honestly don't know, and that causes trouble as well.