The Smart Fortwo Electric Drive is safe. Not 5-star safe, but 4-star safe is still rather decent considering the vehicle's tiny size.
Officially, the NHTSA says that the Smart Fortwo ED scored 4 stars in frontal crash, 4 stars in rollover and 5 stars in side crash. Those results net the Fortwo Electric Drive an overall 4-star rating from the NHTSA.
Above and below you'll find videos and graphics detailing the Smart Fortwo ED in NHTSA testing.