When I'm riding with my biker mates, if some newbie rider or other idiot does the wrong thing, they're told there and then to f**k off and don't come back. In my 9 years or so riding with the same guys, and various guys coming and going from the group, we stand by this rule and no one has brought the wrong attention (sapol etc) down upon us for no reason. I've done it myself where I've removed the keys from the ignition of a rider, told him to f**k off and don't come back. Especially when we found out he had no licence, no rego, and no insurance. We don't need that kind of label.
I've certainly ridden with other groups, and found them to be a pack of hoons and cowboys, who inevitably get screwed over by the cops, and rightly so. I avoid these fools. And the same holds true for car groups.
Perhaps a stricter stance should be taken in the import car enthusiast scene. Speak up there and then ... not on the forum when its too late. Its certainly worked for us bikers. I've certainly had words with a stag owner on one of my cruises from last year.