Might as well decorate their cars with warnings as well, like learners, e.g. "Warning, irresponsible driver". This seems ridiculous because it makes it too obv

Might as well decorate their cars with warnings as well, like learners, e.g. "Warning, irresponsible driver". This seems ridiculous because it makes it too obvious what's going on, ie. allowing proven irresponsible drivers to continue using motor vehicles on the public highway.