I think the problem is what is being taken to the track via public roads. You can build a fast street car for occasional track days and still meet the regulations.
The problem is a lot of the weekend warrior types build a "race" car out of a POS on the cheap and cut corners. Cut springs, no cats, bypassed emissions, race harnesses replacing proper seat belts, dangerous relocation of battery/fuel cell/Nitrous etc. Basically riced out cars that are built poorly by younger wannabe's that still drive like ******** in public are the target of the safety blitz.
You can't deny there are a lot of ****** Civics (or whatever) out there that shouldn't be on the road.
We build track bikes for track days or racing and we trailer them because they can't be on the road. The people targeted are driving their "track" cars, not towing them.
I know it's cool to cry ca$h grab every time someone breaks a rule but how else should it be corrected? Take your license for every offense? There aren't enough jars on the planet to hold the tears that would come from that..... so really I don't see any problem on the police end of ensuring vehicles are road worthy.
If your car is legal you have nothing to worry about. If you want to drive you have to maintain your vehicle properly. Grown up world. If you don't have the money to build a dedicated track car then too ****ing bad for you. I don't have enough money to buy a jet. I'm not all waaaaaaaaaa about it on the internet.
Sorry if that had too much turbodish.