Mercury Spill - Neighborhood Closed

So it's ok to shoot mercury into the veins of humans, and implant it into our teeth, but 3 tablespoons dumped on a driveway closes a neighborhood street for a week?

Authorities close an entire street for a week because of a 3lb mercury spill.  That's about 3 tablespoons of mercury.  For all you mercury poisoned naysayers, do you still think injecting or implanting mercury into humans is a good idea?