These steel rods have become the tent stake of choice because they are relatively cheap and hold up against the playa winds better than standard-issue tent stakes. Most rebar injuries result from stubbing a toe, piercing a foot or otherwise impaling a body part on the exposed metal.
Injuries generally happen at times of low visibility, such as in the dark and massive dust storms.
However, before doing so, you have to make sure you are equipped to pull it out again. Here are a few suggestions. Not only will this remove sharp ends that could hurt people, it will give you good attachment for guy lines and something you can grab when you're trying to pull it out. Bring a crowbar, pipe or something to pull it out with. Archemides, a fulcrum and moving the world.