Not to say these aren't real problems but it's no different to how I ever remember it being. And I feel the roads used to be more dangerous. Whist the stupidity of these punters going onto the circuit is unquestionable it's not entirely new. One numpty threw a beer can onto the road at the Creg a few years back. An MHK (or some government official) also drove a van out his gate onto the road too. Personally I'd push for a jail stay until the boat / plane home in these circumstances. That might put manners on them.
The bad driving is large is largely committed by people who won't respond to any kind of deterrent. I think the police are doing a very good job this year for what it's worth.