Thorium is an interesting nuclear fuel, but its not magic.
It still has many of the inherent problems of all other nuclear power. The very thing that makes nuclear power attractive (a million times more energy than conventional fuel) also carries inherent problems.
Nuclear power, suitably tapped is very safe, and a very clear source of power. However the idea of using nuclear power to fuel cars is just bloody stupid. To run a car you need about 200 kW, and the idea of putting a nuclear power plant in a car that could supply this amount of energy is just bloody stupid on almost every level.