So what do you think of the safety issue of all those people handling LNG?
Remember, it's pressurized to some 2,000 psi in order to become a liquid.
Obviously. That's why I think it's currently such a bad idea for cars. As a substitute for propane delivery however, it might not be so bad. That service is performed by a trained professional. After developing that larger scale infrastructure (IOW from the compression plant to the local distributor, to the tank at a house), the technical developments necessary to fuel cars might be further along: hoses, connectors, crash-worthy fire resistant storage vessels, etc.
Remember, hydraulic hoses with dry break quick-couplers now handle 3ksi with ease.