Is it useful, yes; very efficient at producing power until gen 4 and 5 thorium reactors are made, yes; safe, not really. 

A lot of reactors are in the same state as Japan's. They can all go off due to piss poor management and the expense of use uranium would be insane without subsidies.

This planet is only 7% uranium versus 14% thorium. And only 4% of uranium can be used in reactors versus 100% of thorium.

 Uranium is not the answer. Never has been. We just need the governments of the world to allow thorium reactors.